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doc: Refactors the documentation

Browse source 
This commit refactors the documentation according to my proposal in #1273
and the discussion I had with fd0 on IRC.

The bits from the manual that I could not immediately put into the new
structure are contained in manual_rest.rst Anything else is still there,
nothing has been deleted.

I changed the heading markup to follow the convention used in Python’s
Style Guide for documentation, this convention is explained in a comment
at the top of every file.

I also added a paragraph on installing restic on Debian.
This commit is contained in:
Jan Niggemann 2017-09-30 22:01:19 +02:00 committed by Alexander Neumann
parent 3afd974dea
commit f5b550191c
20 changed files with 1711 additions and 1502 deletions
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..
Normally, there are no heading levels assigned to certain characters as the structure is
determined from the succession of headings. However, this convention is used in Python’s
Style Guide for documenting which you may follow:
# with overline, for parts
* for chapters
= for sections
- for subsections
^ for subsubsections
" for paragraphs
############
Introduction
############

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..
Normally, there are no heading levels assigned to certain characters as the structure is
determined from the succession of headings. However, this convention is used in Python’s
Style Guide for documenting which you may follow:
# with overline, for parts
* for chapters
= for sections
- for subsections
^ for subsubsections
" for paragraphs
############
Installation
############
Packages
********
Mac OS X
========
If you are using Mac OS X, you can install restic using the
`homebrew <http://brew.sh/>`__ package manager:
.. code-block:: console
$ brew tap restic/restic
$ brew install restic
Arch Linux
==========
On `Arch Linux <https://www.archlinux.org/>`__, there is a package called ``restic-git``
which can be installed from AUR, e.g. with ``pacaur``:
.. code-block:: console
$ pacaur -S restic-git
Nix & NixOS
===========
If you are using `Nix <https://nixos.org/nix/>`__ or `NixOS <https://nixos.org/>`__
there is a package available named ``restic``.
It can be installed uisng ``nix-env``:
.. code-block:: console
$ nix-env --install restic
Debian
======
On Debian, there's a package called ``restic`` which can be
installed from the official repos, e.g. with ``apt-get``:
.. code-block:: console
$ apt-get install restic
.. warning:: Please be aware that, at the time of writing, Debian *stable*
has ``restic`` version 0.3.3 which is very old. The *testing* and *unstable*
branches have recent versions of ``restic``.
Pre-compiled Binary
*******************
You can download the latest pre-compiled binary from the `restic release
page <https://github.com/restic/restic/releases/latest>`__.
From Source
***********
restic is written in the Go programming language and you need at least
Go version 1.8. Building restic may also work with older versions of Go,
but that's not supported. See the `Getting
started <https://golang.org/doc/install>`__ guide of the Go project for
instructions how to install Go.
In order to build restic from source, execute the following steps:
.. code-block:: console
$ git clone https://github.com/restic/restic
[...]
$ cd restic
$ go run build.go
You can easily cross-compile restic for all supported platforms, just
supply the target OS and platform via the command-line options like this
(for Windows and FreeBSD respectively):
::
$ go run build.go --goos windows --goarch amd64
$ go run build.go --goos freebsd --goarch 386
The resulting binary is statically linked and does not require any
libraries.
At the moment, the only tested compiler for restic is the official Go
compiler. Building restic with gccgo may work, but is not supported.
Autocompletion
**************
Restic can write out a bash compatible autocompletion script:
.. code-block:: console
$ ./restic autocomplete --help
The "autocomplete" command generates a shell autocompletion script.
NOTE: The current version supports Bash only.
This should work for *nix systems with Bash installed.
By default, the file is written directly to ``/etc/bash_completion.d/``
for convenience, and the command may need superuser rights, e.g.
.. code-block:: console
$ sudo restic autocomplete
Usage:
restic autocomplete [flags]
Flags:
--completionfile string autocompletion file (default "/etc/bash_completion.d/restic.sh")
Global Flags:
--json set output mode to JSON for commands that support it
--no-lock do not lock the repo, this allows some operations on read-only repos
-o, --option key=value set extended option (key=value, can be specified multiple times)
-p, --password-file string read the repository password from a file
-q, --quiet do not output comprehensive progress report
-r, --repo string repository to backup to or restore from (default: $RESTIC_REPOSITORY)

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..
Normally, there are no heading levels assigned to certain characters as the structure is
determined from the succession of headings. However, this convention is used in Python’s
Style Guide for documenting which you may follow:
# with overline, for parts
* for chapters
= for sections
- for subsections
^ for subsubsections
" for paragraphs
##########################
Preparing a new repository
##########################
The place where your backups will be saved at is called a "repository".
This chapter explains how to create ("init") such a repository.
Local
*****
In order to create a repository at ``/tmp/backup``, run the following
command and enter the same password twice:
.. code-block:: console
$ restic init --repo /tmp/backup
enter password for new backend:
enter password again:
created restic backend 085b3c76b9 at /tmp/backup
Please note that knowledge of your password is required to access the repository.
Losing your password means that your data is irrecoverably lost.
.. warning::
Remembering your password is important! If you lose it, you won't be
able to access data stored in the repository.
For automated backups, restic accepts the repository location in the
environment variable ``RESTIC_REPOSITORY``. The password can be read
from a file (via the option ``--password-file`` or the environment variable
``RESTIC_PASSWORD_FILE``) or the environment variable ``RESTIC_PASSWORD``.
SFTP
****
In order to backup data via SFTP, you must first set up a server with
SSH and let it know your public key. Passwordless login is really
important since restic fails to connect to the repository if the server
prompts for credentials.
Once the server is configured, the setup of the SFTP repository can
simply be achieved by changing the URL scheme in the ``init`` command:
.. code-block:: console
$ restic -r sftp:user@host:/tmp/backup init
enter password for new backend:
enter password again:
created restic backend f1c6108821 at sftp:user@host:/tmp/backup
Please note that knowledge of your password is required to access the repository.
Losing your password means that your data is irrecoverably lost.
You can also specify a relative (read: no slash (``/``) character at the
beginning) directory, in this case the dir is relative to the remote
user's home directory.
.. note:: Please be aware that sftp servers do not expand the tilde character
(``~``) normally used as an alias for a user's home directory. If you
want to specify a path relative to the user's home directory, pass a
relative path to the sftp backend.
The backend config string does not allow specifying a port. If you need
to contact an sftp server on a different port, you can create an entry
in the ``ssh`` file, usually located in your user's home directory at
``~/.ssh/config`` or in ``/etc/ssh/ssh_config``:
::
Host foo
User bar
Port 2222
Then use the specified host name ``foo`` normally (you don't need to
specify the user name in this case):
::
$ restic -r sftp:foo:/tmp/backup init
You can also add an entry with a special host name which does not exist,
just for use with restic, and use the ``Hostname`` option to set the
real host name:
::
Host restic-backup-host
Hostname foo
User bar
Port 2222
Then use it in the backend specification:
::
$ restic -r sftp:restic-backup-host:/tmp/backup init
Last, if you'd like to use an entirely different program to create the
SFTP connection, you can specify the command to be run with the option
``-o sftp.command="foobar"``.
REST Server
***********
In order to backup data to the remote server via HTTP or HTTPS protocol,
you must first set up a remote `REST
server <https://github.com/restic/rest-server>`__ instance. Once the
server is configured, accessing it is achieved by changing the URL
scheme like this:
.. code-block:: console
$ restic -r rest:http://host:8000/
Depending on your REST server setup, you can use HTTPS protocol,
password protection, or multiple repositories. Or any combination of
those features, as you see fit. TCP/IP port is also configurable. Here
are some more examples:
.. code-block:: console
$ restic -r rest:https://host:8000/
$ restic -r rest:https://user:pass@host:8000/
$ restic -r rest:https://user:pass@host:8000/my_backup_repo/
If you use TLS, make sure your certificates are signed, 'cause restic
client will refuse to communicate otherwise. It's easy to obtain such
certificates today, thanks to free certificate authorities like `Let’s
Encrypt <https://letsencrypt.org/>`__.
REST server uses exactly the same directory structure as local backend,
so you should be able to access it both locally and via HTTP, even
simultaneously.
Amazon S3
*********
Restic can backup data to any Amazon S3 bucket. However, in this case,
changing the URL scheme is not enough since Amazon uses special security
credentials to sign HTTP requests. By consequence, you must first setup
the following environment variables with the credentials you obtained
while creating the bucket.
.. code-block:: console
$ export AWS_ACCESS_KEY_ID=<MY_ACCESS_KEY>
$ export AWS_SECRET_ACCESS_KEY=<MY_SECRET_ACCESS_KEY>
You can then easily initialize a repository that uses your Amazon S3 as
a backend, if the bucket does not exist yet it will be created in the
default location:
.. code-block:: console
$ restic -r s3:s3.amazonaws.com/bucket_name init
enter password for new backend:
enter password again:
created restic backend eefee03bbd at s3:s3.amazonaws.com/bucket_name
Please note that knowledge of your password is required to access the repository.
Losing your password means that your data is irrecoverably lost.
It is not possible at the moment to have restic create a new bucket in a
different location, so you need to create it using a different program.
Afterwards, the S3 server (``s3.amazonaws.com``) will redirect restic to
the correct endpoint.
For an S3-compatible server that is not Amazon (like Minio, see below),
or is only available via HTTP, you can specify the URL to the server
like this: ``s3:http://server:port/bucket_name``.
Minio Server
************
`Minio <https://www.minio.io>`__ is an Open Source Object Storage,
written in Go and compatible with AWS S3 API.
- Download and Install `Minio
Server <https://minio.io/downloads/#minio-server>`__.
- You can also refer to https://docs.minio.io for step by step guidance
on installation and getting started on Minio Client and Minio Server.
You must first setup the following environment variables with the
credentials of your running Minio Server.
.. code-block:: console
$ export AWS_ACCESS_KEY_ID=<YOUR-MINIO-ACCESS-KEY-ID>
$ export AWS_SECRET_ACCESS_KEY= <YOUR-MINIO-SECRET-ACCESS-KEY>
Now you can easily initialize restic to use Minio server as backend with
this command.
.. code-block:: console
$ ./restic -r s3:http://localhost:9000/restic init
enter password for new backend:
enter password again:
created restic backend 6ad29560f5 at s3:http://localhost:9000/restic1
Please note that knowledge of your password is required to access
the repository. Losing your password means that your data is irrecoverably lost.
OpenStack Swift
***************
Restic can backup data to an OpenStack Swift container. Because Swift supports
various authentication methods, credentials are passed through environment
variables. In order to help integration with existing OpenStack installations,
the naming convention of those variables follows official python swift client:
.. code-block:: console
# For keystone v1 authentication
$ export ST_AUTH=<MY_AUTH_URL>
$ export ST_USER=<MY_USER_NAME>
$ export ST_KEY=<MY_USER_PASSWORD>
# For keystone v2 authentication (some variables are optional)
$ export OS_AUTH_URL=<MY_AUTH_URL>
$ export OS_REGION_NAME=<MY_REGION_NAME>
$ export OS_USERNAME=<MY_USERNAME>
$ export OS_PASSWORD=<MY_PASSWORD>
$ export OS_TENANT_ID=<MY_TENANT_ID>
$ export OS_TENANT_NAME=<MY_TENANT_NAME>
# For keystone v3 authentication (some variables are optional)
$ export OS_AUTH_URL=<MY_AUTH_URL>
$ export OS_REGION_NAME=<MY_REGION_NAME>
$ export OS_USERNAME=<MY_USERNAME>
$ export OS_PASSWORD=<MY_PASSWORD>
$ export OS_USER_DOMAIN_NAME=<MY_DOMAIN_NAME>
$ export OS_PROJECT_NAME=<MY_PROJECT_NAME>
$ export OS_PROJECT_DOMAIN_NAME=<MY_PROJECT_DOMAIN_NAME>
# For authentication based on tokens
$ export OS_STORAGE_URL=<MY_STORAGE_URL>
$ export OS_AUTH_TOKEN=<MY_AUTH_TOKEN>
Restic should be compatible with [OpenStack RC
file](https://docs.openstack.org/user-guide/common/cli-set-environment-variables-using-openstack-rc.html)
in most cases.
Once environment variables are set up, a new repository can be created. The
name of swift container and optional path can be specified. If
the container does not exist, it will be created automatically:
.. code-block:: console
$ restic -r swift:container_name:/path init # path is optional
enter password for new backend:
enter password again:
created restic backend eefee03bbd at swift:container_name:/path
Please note that knowledge of your password is required to access the repository.
Losing your password means that your data is irrecoverably lost.
The policy of new container created by restic can be changed using environment variable:
.. code-block:: console
$ export SWIFT_DEFAULT_CONTAINER_POLICY=<MY_CONTAINER_POLICY>
Backblaze B2
************
Restic can backup data to any Backblaze B2 bucket. You need to first setup the
following environment variables with the credentials you obtained when signed
into your B2 account:
.. code-block:: console
$ export B2_ACCOUNT_ID=<MY_ACCOUNT_ID>
$ export B2_ACCOUNT_KEY=<MY_SECRET_ACCOUNT_KEY>
You can then easily initialize a repository stored at Backblaze B2. If the
bucket does not exist yet, it will be created:
.. code-block:: console
$ restic -r b2:bucketname:path/to/repo init
enter password for new backend:
enter password again:
created restic backend eefee03bbd at b2:bucketname:path/to/repo
Please note that knowledge of your password is required to access the repository.
Losing your password means that your data is irrecoverably lost.
The number of concurrent connections to the B2 service can be set with the `-o
b2.connections=10`. By default, at most five parallel connections are
established.
Microsoft Azure Blob Storage
****************************
You can also store backups on Microsoft Azure Blob Storage. Export the Azure
account name and key as follows:
.. code-block:: console
$ export AZURE_ACCOUNT_NAME=<ACCOUNT_NAME>
$ export AZURE_ACCOUNT_KEY=<SECRET_KEY>
Afterwards you can initialize a repository in a container called `foo` in the
root path like this:
.. code-block:: console
$ restic -r azure:foo:/ init
enter password for new backend:
enter password again:
created restic backend a934bac191 at azure:foo:/
[...]
The number of concurrent connections to the B2 service can be set with the
`-o azure.connections=10`. By default, at most five parallel connections are
established.
Google Cloud Storage
********************
Restic supports Google Cloud Storage as a backend.
Restic connects to Google Cloud Storage via a `service account`_.
For normal restic operation, the service account must have the
``storage.objects.{create,delete,get,list}`` permissions for the bucket. These
are included in the "Storage Object Admin" role.
``restic init`` can create the repository bucket. Doing so requires the
``storage.buckets.create`` permission ("Storage Admin" role). If the bucket
already exists, that permission is unnecessary.
To use the Google Cloud Storage backend, first `create a service account key`_
and download the JSON credentials file.
Second, find the Google Project ID that you can see in the Google Cloud
Platform console at the "Storage/Settings" menu. Export the path to the JSON
key file and the project ID as follows:
.. code-block:: console
$ export GOOGLE_PROJECT_ID=123123123123
$ export GOOGLE_APPLICATION_CREDENTIALS=$HOME/.config/gs-secret-restic-key.json
Then you can use the ``gs:`` backend type to create a new repository in the
bucket `foo` at the root path:
.. code-block:: console
$ restic -r gs:foo:/ init
enter password for new backend:
enter password again:
created restic backend bde47d6254 at gs:foo2/
[...]
The number of concurrent connections to the GCS service can be set with the
`-o gs.connections=10`. By default, at most five parallel connections are
established.
.. _service account: https://cloud.google.com/storage/docs/authentication#service_accounts
.. _create a service account key: https://cloud.google.com/storage/docs/authentication#generating-a-private-key
Password prompt on Windows
**************************
At the moment, restic only supports the default Windows console
interaction. If you use emulation environments like
`MSYS2 <https://msys2.github.io/>`__ or
`Cygwin <https://www.cygwin.com/>`__, which use terminals like
``Mintty`` or ``rxvt``, you may get a password error:
You can workaround this by using a special tool called ``winpty`` (look
`here <https://sourceforge.net/p/msys2/wiki/Porting/>`__ and
`here <https://github.com/rprichard/winpty>`__ for detail information).
On MSYS2, you can install ``winpty`` as follows:
.. code-block:: console
$ pacman -S winpty
$ winpty restic -r /tmp/backup init

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..
Normally, there are no heading levels assigned to certain characters as the structure is
determined from the succession of headings. However, this convention is used in Python’s
Style Guide for documenting which you may follow:
# with overline, for parts
* for chapters
= for sections
- for subsections
^ for subsubsections
" for paragraphs
##########
Backing up
##########
Now we're ready to backup some data. The contents of a directory at a
specific point in time is called a "snapshot" in restic. Run the
following command and enter the repository password you chose above
again:
.. code-block:: console
$ restic -r /tmp/backup backup ~/work
enter password for repository:
scan [/home/user/work]
scanned 764 directories, 1816 files in 0:00
[0:29] 100.00% 54.732 MiB/s 1.582 GiB / 1.582 GiB 2580 / 2580 items 0 errors ETA 0:00
duration: 0:29, 54.47MiB/s
snapshot 40dc1520 saved
As you can see, restic created a backup of the directory and was pretty
fast! The specific snapshot just created is identified by a sequence of
hexadecimal characters, ``40dc1520`` in this case.
If you run the command again, restic will create another snapshot of
your data, but this time it's even faster. This is de-duplication at
work!
.. code-block:: console
$ restic -r /tmp/backup backup ~/work
enter password for repository:
using parent snapshot 40dc1520aa6a07b7b3ae561786770a01951245d2367241e71e9485f18ae8228c
scan [/home/user/work]
scanned 764 directories, 1816 files in 0:00
[0:00] 100.00% 0B/s 1.582 GiB / 1.582 GiB 2580 / 2580 items 0 errors ETA 0:00
duration: 0:00, 6572.38MiB/s
snapshot 79766175 saved
You can even backup individual files in the same repository.
.. code-block:: console
$ restic -r /tmp/backup backup ~/work.txt
scan [/home/user/work.txt]
scanned 0 directories, 1 files in 0:00
[0:00] 100.00% 0B/s 220B / 220B 1 / 1 items 0 errors ETA 0:00
duration: 0:00, 0.03MiB/s
snapshot 31f7bd63 saved
In fact several hosts may use the same repository to backup directories
and files leading to a greater de-duplication.
Please be aware that when you backup different directories (or the
directories to be saved have a variable name component like a
time/date), restic always needs to read all files and only afterwards
can compute which parts of the files need to be saved. When you backup
the same directory again (maybe with new or changed files) restic will
find the old snapshot in the repo and by default only reads those files
that are new or have been modified since the last snapshot. This is
decided based on the modify date of the file in the file system.
Now is a good time to run ``restic check`` to verify that all data
is properly stored in the repository. You should run this command regularly
to make sure the internal structure of the repository is free of errors.
You can exclude folders and files by specifying exclude-patterns. Either
specify them with multiple ``--exclude``'s or one ``--exclude-file``
.. code-block:: console
$ cat exclude
# exclude go-files
*.go
# exclude foo/x/y/z/bar foo/x/bar foo/bar
foo/**/bar
$ restic -r /tmp/backup backup ~/work --exclude=*.c --exclude-file=exclude
Patterns use `filepath.Glob <https://golang.org/pkg/path/filepath/#Glob>`__ internally,
see `filepath.Match <https://golang.org/pkg/path/filepath/#Match>`__ for syntax.
Additionally ``**`` excludes arbitrary subdirectories.
Environment-variables in exclude-files are expanded with
`os.ExpandEnv <https://golang.org/pkg/os/#ExpandEnv>`__.
By specifying the option ``--one-file-system`` you can instruct restic
to only backup files from the file systems the initially specified files
or directories reside on. For example, calling restic like this won't
backup ``/sys`` or ``/dev`` on a Linux system:
.. code-block:: console
$ restic -r /tmp/backup backup --one-file-system /
By using the ``--files-from`` option you can read the files you want to
backup from a file. This is especially useful if a lot of files have to
be backed up that are not in the same folder or are maybe pre-filtered
by other software.
or example maybe you want to backup files that have a certain filename
in them:
.. code-block:: console
$ find /tmp/somefiles | grep 'PATTERN' > /tmp/files_to_backup
You can then use restic to backup the filtered files:
.. code-block:: console
$ restic -r /tmp/backup backup --files-from /tmp/files_to_backup
Incidentally you can also combine ``--files-from`` with the normal files
args:
.. code-block:: console
$ restic -r /tmp/backup backup --files-from /tmp/files_to_backup /tmp/some_additional_file
Backing up special items
************************
**Symlinks** are archieved as symlinks, ``restic`` does not follow them.
When you restore, you get the same symlink again, with the same link target
and the same timestamps.
If there is a **bind-mount** below a directory that is to be saved, restic descends into it.
**Device files** are saved and restored as device files. This means that e.g. ``/dev/sda`` is
archived as a block device file and restored as such. This also means that the content of the
corresponding disk is not read, at least not from the device file.
Reading data from stdin
***********************
Sometimes it can be nice to directly save the output of a program, e.g.
``mysqldump`` so that the SQL can later be restored. Restic supports
this mode of operation, just supply the option ``--stdin`` to the
``backup`` command like this:
.. code-block:: console
$ mysqldump [...] | restic -r /tmp/backup backup --stdin
This creates a new snapshot of the output of ``mysqldump``. You can then
use e.g. the fuse mounting option (see below) to mount the repository
and read the file.
By default, the file name ``stdin`` is used, a different name can be
specified with ``--stdin-filename``, e.g. like this:
.. code-block:: console
$ mysqldump [...] | restic -r /tmp/backup backup --stdin --stdin-filename production.sql
Tags for backup
***************
Snapshots can have one or more tags, short strings which add identifying
information. Just specify the tags for a snapshot one by one with ``--tag``:
.. code-block:: console
$ restic -r /tmp/backup backup --tag projectX --tag foo --tag bar ~/work
[...]
The tags can later be used to keep (or forget) snapshots with the ``forget``
command. The command ``tag`` can be used to modify tags on an existing
snapshot.

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..
Normally, there are no heading levels assigned to certain characters as the structure is
determined from the succession of headings. However, this convention is used in Python’s
Style Guide for documenting which you may follow:
# with overline, for parts
* for chapters
= for sections
- for subsections
^ for subsubsections
" for paragraphs
#########################
Working with repositories
#########################
Listing all snapshots
=====================
Now, you can list all the snapshots stored in the repository:
.. code-block:: console
$ restic -r /tmp/backup snapshots
enter password for repository:
ID Date Host Tags Directory
----------------------------------------------------------------------
40dc1520 2015-05-08 21:38:30 kasimir /home/user/work
79766175 2015-05-08 21:40:19 kasimir /home/user/work
bdbd3439 2015-05-08 21:45:17 luigi /home/art
590c8fc8 2015-05-08 21:47:38 kazik /srv
9f0bc19e 2015-05-08 21:46:11 luigi /srv
You can filter the listing by directory path:
.. code-block:: console
$ restic -r /tmp/backup snapshots --path="/srv"
enter password for repository:
ID Date Host Tags Directory
----------------------------------------------------------------------
590c8fc8 2015-05-08 21:47:38 kazik /srv
9f0bc19e 2015-05-08 21:46:11 luigi /srv
Or filter by host:
.. code-block:: console
$ restic -r /tmp/backup snapshots --host luigi
enter password for repository:
ID Date Host Tags Directory
----------------------------------------------------------------------
bdbd3439 2015-05-08 21:45:17 luigi /home/art
9f0bc19e 2015-05-08 21:46:11 luigi /srv
Combining filters is also possible.
Checking a repo's integrity and consistency
===========================================
Imagine your repository is saved on a server that has a faulty hard
drive, or even worse, attackers get privileged access and modify your
backup with the intention to make you restore malicious data:
.. code-block:: console
$ sudo echo "boom" >> backup/index/d795ffa99a8ab8f8e42cec1f814df4e48b8f49129360fb57613df93739faee97
In order to detect these things, it is a good idea to regularly use the
``check`` command to test whether everything is alright, your precious
backup data is consistent and the integrity is unharmed:
.. code-block:: console
$ restic -r /tmp/backup check
Load indexes
ciphertext verification failed
Trying to restore a snapshot which has been modified as shown above will
yield the same error:
.. code-block:: console
$ restic -r /tmp/backup restore 79766175 --target /tmp/restore-work
Load indexes
ciphertext verification failed

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..
Normally, there are no heading levels assigned to certain characters as the structure is
determined from the succession of headings. However, this convention is used in Python’s
Style Guide for documenting which you may follow:
# with overline, for parts
* for chapters
= for sections
- for subsections
^ for subsubsections
" for paragraphs
#####################
Restoring from backup
#####################
Restoring from a snapshot
=========================
Restoring a snapshot is as easy as it sounds, just use the following
command to restore the contents of the latest snapshot to
``/tmp/restore-work``:
.. code-block:: console
$ restic -r /tmp/backup restore 79766175 --target /tmp/restore-work
enter password for repository:
restoring <Snapshot of [/home/user/work] at 2015-05-08 21:40:19.884408621 +0200 CEST> to /tmp/restore-work
Use the word ``latest`` to restore the last backup. You can also combine
``latest`` with the ``--host`` and ``--path`` filters to choose the last
backup for a specific host, path or both.
.. code-block:: console
$ restic -r /tmp/backup restore latest --target /tmp/restore-art --path "/home/art" --host luigi
enter password for repository:
restoring <Snapshot of [/home/art] at 2015-05-08 21:45:17.884408621 +0200 CEST> to /tmp/restore-art
Use ``--exclude`` and ``--include`` to restrict the restore to a subset of
files in the snapshot. For example, to restore a single file:
.. code-block:: console
$ restic -r /tmp/backup restore 79766175 --target /tmp/restore-work --include /work/foo
enter password for repository:
restoring <Snapshot of [/home/user/work] at 2015-05-08 21:40:19.884408621 +0200 CEST> to /tmp/restore-work
This will restore the file ``foo`` to ``/tmp/restore-work/work/foo``.
Restore using mount
===================
Browsing your backup as a regular file system is also very easy. First,
create a mount point such as ``/mnt/restic`` and then use the following
command to serve the repository with FUSE:
.. code-block:: console
$ mkdir /mnt/restic
$ restic -r /tmp/backup mount /mnt/restic
enter password for repository:
Now serving /tmp/backup at /mnt/restic
Don't forget to umount after quitting!
Mounting repositories via FUSE is not possible on Windows and OpenBSD.
Restic supports storage and preservation of hard links. However, since
hard links exist in the scope of a filesystem by definition, restoring
hard links from a fuse mount should be done by a program that preserves
hard links. A program that does so is ``rsync``, used with the option
--hard-links.

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@ -0,0 +1,208 @@
..
Normally, there are no heading levels assigned to certain characters as the structure is
determined from the succession of headings. However, this convention is used in Python’s
Style Guide for documenting which you may follow:
# with overline, for parts
* for chapters
= for sections
- for subsections
^ for subsubsections
" for paragraphs
#########################
Removing backup snapshots
#########################
All backup space is finite, so restic allows removing old snapshots.
This can be done either manually (by specifying a snapshot ID to remove)
or by using a policy that describes which snapshots to forget. For all
remove operations, two commands need to be called in sequence:
``forget`` to remove a snapshot and ``prune`` to actually remove the
data that was referenced by the snapshot from the repository. This can
be automated with the ``--prune`` option of the ``forget`` command,
which runs ``prune`` automatically if snapshots have been removed.
It is advisable to run ``restic check`` after pruning, to make sure
you are alerted, should the internal data structures of the repository
be damaged.
Remove a single snapshot
************************
The command ``snapshots`` can be used to list all snapshots in a
repository like this:
.. code-block:: console
$ restic -r /tmp/backup snapshots
enter password for repository:
ID Date Host Tags Directory
----------------------------------------------------------------------
40dc1520 2015-05-08 21:38:30 kasimir /home/user/work
79766175 2015-05-08 21:40:19 kasimir /home/user/work
bdbd3439 2015-05-08 21:45:17 luigi /home/art
590c8fc8 2015-05-08 21:47:38 kazik /srv
9f0bc19e 2015-05-08 21:46:11 luigi /srv
In order to remove the snapshot of ``/home/art``, use the ``forget``
command and specify the snapshot ID on the command line:
.. code-block:: console
$ restic -r /tmp/backup forget bdbd3439
enter password for repository:
removed snapshot d3f01f63
Afterwards this snapshot is removed:
.. code-block:: console
$ restic -r /tmp/backup snapshots
enter password for repository:
ID Date Host Tags Directory
----------------------------------------------------------------------
40dc1520 2015-05-08 21:38:30 kasimir /home/user/work
79766175 2015-05-08 21:40:19 kasimir /home/user/work
590c8fc8 2015-05-08 21:47:38 kazik /srv
9f0bc19e 2015-05-08 21:46:11 luigi /srv
But the data that was referenced by files in this snapshot is still
stored in the repository. To cleanup unreferenced data, the ``prune``
command must be run:
.. code-block:: console
$ restic -r /tmp/backup prune
enter password for repository:
counting files in repo
building new index for repo
[0:00] 100.00% 22 / 22 files
repository contains 22 packs (8512 blobs) with 100.092 MiB bytes
processed 8512 blobs: 0 duplicate blobs, 0B duplicate
load all snapshots
find data that is still in use for 1 snapshots
[0:00] 100.00% 1 / 1 snapshots
found 8433 of 8512 data blobs still in use
will rewrite 3 packs
creating new index
[0:00] 86.36% 19 / 22 files
saved new index as 544a5084
done
Afterwards the repository is smaller.
You can automate this two-step process by using the ``--prune`` switch
to ``forget``:
.. code-block:: console
$ restic forget --keep-last 1 --prune
snapshots for host mopped, directories /home/user/work:
keep 1 snapshots:
ID Date Host Tags Directory
----------------------------------------------------------------------
4bba301e 2017-02-21 10:49:18 mopped /home/user/work
remove 1 snapshots:
ID Date Host Tags Directory
----------------------------------------------------------------------
8c02b94b 2017-02-21 10:48:33 mopped /home/user/work
1 snapshots have been removed, running prune
counting files in repo
building new index for repo
[0:00] 100.00% 37 / 37 packs
repository contains 37 packs (5521 blobs) with 151.012 MiB bytes
processed 5521 blobs: 0 duplicate blobs, 0B duplicate
load all snapshots
find data that is still in use for 1 snapshots
[0:00] 100.00% 1 / 1 snapshots
found 5323 of 5521 data blobs still in use, removing 198 blobs
will delete 0 packs and rewrite 27 packs, this frees 22.106 MiB
creating new index
[0:00] 100.00% 30 / 30 packs
saved new index as b49f3e68
done
Removing snapshots according to a policy
****************************************
Removing snapshots manually is tedious and error-prone, therefore restic
allows specifying which snapshots should be removed automatically
according to a policy. You can specify how many hourly, daily, weekly,
monthly and yearly snapshots to keep, any other snapshots are removed.
The most important command-line parameter here is ``--dry-run`` which
instructs restic to not remove anything but print which snapshots would
be removed.
When ``forget`` is run with a policy, restic loads the list of all
snapshots, then groups these by host name and list of directories. The grouping
options can be set with ``--group-by``, to only group snapshots by paths and
tags use ``--group-by paths,tags``. The policy is then applied to each group of
snapshots separately. This is a safety feature.
The ``forget`` command accepts the following parameters:
- ``--keep-last n`` never delete the ``n`` last (most recent) snapshots
- ``--keep-hourly n`` for the last ``n`` hours in which a snapshot was
made, keep only the last snapshot for each hour.
- ``--keep-daily n`` for the last ``n`` days which have one or more
snapshots, only keep the last one for that day.
- ``--keep-weekly n`` for the last ``n`` weeks which have one or more
snapshots, only keep the last one for that week.
- ``--keep-monthly n`` for the last ``n`` months which have one or more
snapshots, only keep the last one for that month.
- ``--keep-yearly n`` for the last ``n`` years which have one or more
snapshots, only keep the last one for that year.
- ``--keep-tag`` keep all snapshots which have all tags specified by
this option (can be specified multiple times).
Additionally, you can restrict removing snapshots to those which have a
particular hostname with the ``--hostname`` parameter, or tags with the
``--tag`` option. When multiple tags are specified, only the snapshots
which have all the tags are considered. For example, the following command
removes all but the latest snapshot of all snapshots that have the tag ``foo``:
.. code-block:: console
$ restic forget --tag foo --keep-last 1
This command removes all but the last snapshot of all snapshots that have
either the ``foo`` or ``bar`` tag set:
.. code-block:: console
$ restic forget --tag foo --tag bar --keep-last 1
To only keep the last snapshot of all snapshots with both the tag ``foo`` and
``bar`` set use:
.. code-block:: console
$ restic forget --tag foo,tag bar --keep-last 1
All the ``--keep-*`` options above only count
hours/days/weeks/months/years which have a snapshot, so those without a
snapshot are ignored.
All snapshots are evaluated counted against all matching keep-* counts. A
single snapshot on 2017-09-30 (Sun) will count as a daily, weekly and monthly.
Let's explain this with an example: Suppose you have only made a backup
on each Sunday for 12 weeks. Then ``forget --keep-daily 4`` will keep
the last four snapshots for the last four Sundays, but remove the rest.
Only counting the days which have a backup and ignore the ones without
is a safety feature: it prevents restic from removing many snapshots
when no new ones are created. If it was implemented otherwise, running
``forget --keep-daily 4`` on a Friday would remove all snapshots!
Another example: Suppose you make daily backups for 100 years. Then
``forget --keep-daily 7 --keep-weekly 5 --keep-monthly 12 --keep-yearly 75``
will keep the most recent 7 daily snapshots, then 4 (remember, 7 dailies
already include a week!) last-day-of-the-weeks and 11 or 12
last-day-of-the-months (11 or 12 depends if the 5 weeklies cross a month).
And finally 75 last-day-of-the-year snapshots. All other snapshots are
removed.

51
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@ -0,0 +1,51 @@
..
Normally, there are no heading levels assigned to certain characters as the structure is
determined from the succession of headings. However, this convention is used in Python’s
Style Guide for documenting which you may follow:
# with overline, for parts
* for chapters
= for sections
- for subsections
^ for subsubsections
" for paragraphs
##########
Encryption
##########
*"The design might not be perfect, but it’s good. Encryption is a first-class feature,
the implementation looks sane and I guess the deduplication trade-off is worth it. So… I’m going to use restic for
my personal backups.*" `Filippo Valsorda`_
.. _Filippo Valsorda: https://blog.filippo.io/restic-cryptography/
**********************
Manage repository keys
**********************
The ``key`` command allows you to set multiple access keys or passwords
per repository. In fact, you can use the ``list``, ``add``, ``remove``
and ``passwd`` sub-commands to manage these keys very precisely:
.. code-block:: console
$ restic -r /tmp/backup key list
enter password for repository:
ID User Host Created
----------------------------------------------------------------------
*eb78040b username kasimir 2015-08-12 13:29:57
$ restic -r /tmp/backup key add
enter password for repository:
enter password for new key:
enter password again:
saved new key as <Key of username@kasimir, created on 2015-08-12 13:35:05.316831933 +0200 CEST>
$ restic -r backup key list
enter password for repository:
ID User Host Created
----------------------------------------------------------------------
5c657874 username kasimir 2015-08-12 13:35:05
*eb78040b username kasimir 2015-08-12 13:29:57

31
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@ -1,15 +1,32 @@
..
Normally, there are no heading levels assigned to certain characters as the structure is
determined from the succession of headings. However, this convention is used in Python’s
Style Guide for documenting which you may follow:
# with overline, for parts
* for chapters
= for sections
- for subsections
^ for subsubsections
" for paragraphs
########
Examples
########
********************************
Setting up restic with Amazon S3 Setting up restic with Amazon S3
================================ ********************************
Preface Preface
------- =======
This tutorial will show you how to use restic with AWS S3. It will show you how This tutorial will show you how to use restic with AWS S3. It will show you how
to navigate the AWS web interface, create an S3 bucket, create a user with to navigate the AWS web interface, create an S3 bucket, create a user with
access to only this bucket, and finally how to connect restic to this bucket. access to only this bucket, and finally how to connect restic to this bucket.
Prerequisites Prerequisites
------------- =============
You should already have a ``restic`` binary available on your system that you can You should already have a ``restic`` binary available on your system that you can
run. Furthermore, you should also have an account with run. Furthermore, you should also have an account with
@ -19,7 +36,7 @@ details for billing purposes, even if you use their
Logging into AWS Logging into AWS
---------------- ================
Point your browser to Point your browser to
https://console.aws.amazon.com https://console.aws.amazon.com
@ -39,7 +56,7 @@ Access Management (IAM) are relevant.
Creating the bucket Creating the bucket
------------------- ===================
First, a bucket to store your backups in must be created. Using the "Services" First, a bucket to store your backups in must be created. Using the "Services"
menu, navigate to S3. In case you already have some S3 buckets, you will see a menu, navigate to S3. In case you already have some S3 buckets, you will see a
@ -71,7 +88,7 @@ buckets:
:alt: List With New Bucket :alt: List With New Bucket
Creating a user Creating a user
--------------- ===============
Use the "Services" menu of the AWS web interface to navigate to IAM. This will Use the "Services" menu of the AWS web interface to navigate to IAM. This will
bring you to the IAM homepage. To create a new user, click on the "Users" menu bring you to the IAM homepage. To create a new user, click on the "Users" menu
@ -177,7 +194,7 @@ browser now.
Initializing the restic repository Initializing the restic repository
---------------------------------- ==================================
Open a terminal and make sure you have the ``restic`` binary ready. First, choose Open a terminal and make sure you have the ``restic`` binary ready. First, choose
a password to encrypt your backups with. In this tutorial, ``apg`` is used for a password to encrypt your backups with. In this tutorial, ``apg`` is used for

85
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@ -1,8 +1,75 @@
Development ..
=========== Normally, there are no heading levels assigned to certain characters as the structure is
determined from the succession of headings. However, this convention is used in Python’s
Style Guide for documenting which you may follow:
# with overline, for parts
* for chapters
= for sections
- for subsections
^ for subsubsections
" for paragraphs
#############
Participating
#############
*********
Debugging
*********
The program can be built with debug support like this:
.. code-block:: console
$ go run build.go -tags debug
Afterwards, extensive debug messages are written to the file in
environment variable ``DEBUG_LOG``, e.g.:
.. code-block:: console
$ DEBUG_LOG=/tmp/restic-debug.log restic backup ~/work
If you suspect that there is a bug, you can have a look at the debug
log. Please be aware that the debug log might contain sensitive
information such as file and directory names.
The debug log will always contain all log messages restic generates. You
can also instruct restic to print some or all debug messages to stderr.
These can also be limited to e.g. a list of source files or a list of
patterns for function names. The patterns are globbing patterns (see the
documentation for `path.Glob <https://golang.org/pkg/path/#Glob>`__), multiple
patterns are separated by commas. Patterns are case sensitive.
Printing all log messages to the console can be achieved by setting the
file filter to ``*``:
.. code-block:: console
$ DEBUG_FILES=* restic check
If you want restic to just print all debug log messages from the files
``main.go`` and ``lock.go``, set the environment variable
``DEBUG_FILES`` like this:
.. code-block:: console
$ DEBUG_FILES=main.go,lock.go restic check
The following command line instructs restic to only print debug
statements originating in functions that match the pattern ``*unlock*``
(case sensitive):
.. code-block:: console
$ DEBUG_FUNCS=*unlock* restic check
************
Contributing
************
Contribute
----------
Contributions are welcome! Please **open an issue first** (or add a Contributions are welcome! Please **open an issue first** (or add a
comment to an existing issue) if you plan to work on any code or add a comment to an existing issue) if you plan to work on any code or add a
new feature. This way, duplicate work is prevented and we can discuss new feature. This way, duplicate work is prevented and we can discuss
@ -21,8 +88,10 @@ A few issues have been tagged with the label ``help wanted``, you can
start looking at those: start looking at those:
https://github.com/restic/restic/labels/help%20wanted https://github.com/restic/restic/labels/help%20wanted
********
Security Security
-------- ********
**Important**: If you discover something that you believe to be a **Important**: If you discover something that you believe to be a
possible critical security problem, please do *not* open a GitHub issue possible critical security problem, please do *not* open a GitHub issue
but send an email directly to alexander@bumpern.de. If possible, please but send an email directly to alexander@bumpern.de. If possible, please
@ -36,8 +105,9 @@ encrypt your email using the following PGP key
uid Alexander Neumann <alexander@bumpern.de> uid Alexander Neumann <alexander@bumpern.de>
sub 4096R/D5FC2ACF4043FDF1 2014-11-01 sub 4096R/D5FC2ACF4043FDF1 2014-11-01
*************
Compatibility Compatibility
------------- *************
Backward compatibility for backups is important so that our users are Backward compatibility for backups is important so that our users are
always able to restore saved data. Therefore restic follows `Semantic always able to restore saved data. Therefore restic follows `Semantic
@ -52,8 +122,9 @@ version; as long as we do not increment the major version, data can be
read and restored. We strive to be fully backward compatible to all read and restored. We strive to be fully backward compatible to all
prior versions. prior versions.
**********************
Building documentation Building documentation
---------------------- **********************
The restic documentation is built with `Sphinx <http://sphinx-doc.org>`__, The restic documentation is built with `Sphinx <http://sphinx-doc.org>`__,
therefore building it locally requires a recent Python version and requirements listed in ``doc/requirements.txt``. therefore building it locally requires a recent Python version and requirements listed in ``doc/requirements.txt``.

180
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@ -1,8 +1,25 @@
..
Normally, there are no heading levels assigned to certain characters as the structure is
determined from the succession of headings. However, this convention is used in Python’s
Style Guide for documenting which you may follow:
# with overline, for parts
* for chapters
= for sections
- for subsections
^ for subsubsections
" for paragraphs
##########
References
##########
******
Design Design
====== ******
Terminology Terminology
----------- ===========
This section introduces terminology used in this document. This section introduces terminology used in this document.
@ -26,7 +43,7 @@ the repository. This ID is required in order to load the file from the
repository. repository.
Repository Format Repository Format
----------------- =================
All data is stored in a restic repository. A repository is able to store All data is stored in a restic repository. A repository is able to store
data of several different types, which can later be requested based on data of several different types, which can later be requested based on
@ -77,7 +94,7 @@ locally. The field ``chunker_polynomial`` contains a parameter that is
used for splitting large files into smaller chunks (see below). used for splitting large files into smaller chunks (see below).
Repository Layout Repository Layout
~~~~~~~~~~~~~~~~~ -----------------
The ``local`` and ``sftp`` backends are implemented using files and The ``local`` and ``sftp`` backends are implemented using files and
directories stored in a file system. The directory layout is the same directories stored in a file system. The directory layout is the same
@ -125,7 +142,7 @@ the option ``-o local.layout=default``, valid values are ``default`` and
s3 backend ``s3.layout``. s3 backend ``s3.layout``.
S3 Legacy Layout S3 Legacy Layout
~~~~~~~~~~~~~~~~ ----------------
Unfortunately during development the AWS S3 backend uses slightly different Unfortunately during development the AWS S3 backend uses slightly different
paths (directory names use singular instead of plural for ``key``, paths (directory names use singular instead of plural for ``key``,
@ -154,7 +171,7 @@ The S3 backend understands and accepts both forms, new backends are
always created with the default layout for compatibility reasons. always created with the default layout for compatibility reasons.
Pack Format Pack Format
----------- ===========
All files in the repository except Key and Pack files just contain raw All files in the repository except Key and Pack files just contain raw
data, stored as ``IV || Ciphertext || MAC``. Pack files may contain one data, stored as ``IV || Ciphertext || MAC``. Pack files may contain one
@ -212,7 +229,7 @@ header. Afterwards, the header can be read and parsed, which yields all
plaintext hashes, types, offsets and lengths of all included blobs. plaintext hashes, types, offsets and lengths of all included blobs.
Indexing Indexing
-------- ========
Index files contain information about Data and Tree Blobs and the Packs Index files contain information about Data and Tree Blobs and the Packs
they are contained in and store this information in the repository. When they are contained in and store this information in the repository. When
@ -268,7 +285,7 @@ on non-disjoint sets of Packs. The number of packs described in a single
file is chosen so that the file size is kept below 8 MiB. file is chosen so that the file size is kept below 8 MiB.
Keys, Encryption and MAC Keys, Encryption and MAC
------------------------ ========================
All data stored by restic in the repository is encrypted with AES-256 in All data stored by restic in the repository is encrypted with AES-256 in
counter mode and authenticated using Poly1305-AES. For encrypting new counter mode and authenticated using Poly1305-AES. For encrypting new
@ -347,7 +364,7 @@ each. This way, the password can be changed without having to re-encrypt
all data. all data.
Snapshots Snapshots
--------- =========
A snapshot represents a directory with all files and sub-directories at A snapshot represents a directory with all files and sub-directories at
a given point in time. For each backup that is made, a new snapshot is a given point in time. For each backup that is made, a new snapshot is
@ -417,7 +434,7 @@ a Pack file , an index is used. If the index is not available, the
header of all data Blobs can be read. header of all data Blobs can be read.
Trees and Data Trees and Data
-------------- ==============
A snapshot references a tree by the SHA-256 hash of the JSON string A snapshot references a tree by the SHA-256 hash of the JSON string
representation of its contents. Trees and data are saved in pack files representation of its contents. Trees and data are saved in pack files
@ -503,7 +520,7 @@ matches the plaintext hash from the map included in the tree above, so
the correct data has been returned. the correct data has been returned.
Locks Locks
----- =====
The restic repository structure is designed in a way that allows The restic repository structure is designed in a way that allows
parallel access of multiple instance of restic and even parallel writes. parallel access of multiple instance of restic and even parallel writes.
@ -547,7 +564,7 @@ appeared in the repository. Depending on the type of the other locks and
the lock to be created, restic either continues or fails. the lock to be created, restic either continues or fails.
Backups and Deduplication Backups and Deduplication
------------------------- =========================
For creating a backup, restic scans the source directory for all files, For creating a backup, restic scans the source directory for all files,
sub-directories and other entries. The data from each file is split into sub-directories and other entries. The data from each file is split into
@ -565,7 +582,7 @@ backup. This even works if bytes are inserted or removed at arbitrary
positions within the file. positions within the file.
Threat Model Threat Model
------------ ============
The design goals for restic include being able to securely store backups The design goals for restic include being able to securely store backups
in a location that is not completely trusted, e.g. a shared system where in a location that is not completely trusted, e.g. a shared system where
@ -607,3 +624,140 @@ stored files) which files belong to what snapshot. When only these files
are deleted, the particular snapshot vanished and all snapshots are deleted, the particular snapshot vanished and all snapshots
depending on data that has been added in the snapshot cannot be restored depending on data that has been added in the snapshot cannot be restored
completely. Restic is not designed to detect this attack. completely. Restic is not designed to detect this attack.
Local Cache
===========
In order to speed up certain operations, restic manages a local cache of data.
This document describes the data structures for the local cache with version 1.
Versions
--------
The cache directory is selected according to the `XDG base dir specification
<http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html>`__.
Each repository has its own cache sub-directory, consting of the repository ID
which is chosen at ``init``. All cache directories for different repos are
independent of each other.
The cache dir for a repo contains a file named ``version``, which contains a
single ASCII integer line that stands for the current version of the cache. If
a lower version number is found the cache is recreated with the current
version. If a higher version number is found the cache is ignored and left as
is.
Snapshots and Indexes
---------------------
Snapshot, Data and Index files are cached in the sub-directories ``snapshots``,
``data`` and ``index``, as read from the repository.
************
REST Backend
************
Restic can interact with HTTP Backend that respects the following REST
API. The following values are valid for ``{type}``: ``data``, ``keys``,
``locks``, ``snapshots``, ``index``, ``config``. ``{path}`` is a path to
the repository, so that multiple different repositories can be accessed.
The default path is ``/``.
POST {path}?create=true
=======================
This request is used to initially create a new repository. The server
responds with "200 OK" if the repository structure was created
successfully or already exists, otherwise an error is returned.
DELETE {path}
=============
Deletes the repository on the server side. The server responds with "200
OK" if the repository was successfully removed. If this function is not
implemented the server returns "501 Not Implemented", if this it is
denied by the server it returns "403 Forbidden".
HEAD {path}/config
==================
Returns "200 OK" if the repository has a configuration, an HTTP error
otherwise.
GET {path}/config
=================
Returns the content of the configuration file if the repository has a
configuration, an HTTP error otherwise.
Response format: binary/octet-stream
POST {path}/config
==================
Returns "200 OK" if the configuration of the request body has been
saved, an HTTP error otherwise.
GET {path}/{type}/
==================
Returns a JSON array containing the names of all the blobs stored for a
given type.
Response format: JSON
HEAD {path}/{type}/{name}
=========================
Returns "200 OK" if the blob with the given name and type is stored in
the repository, "404 not found" otherwise. If the blob exists, the HTTP
header ``Content-Length`` is set to the file size.
GET {path}/{type}/{name}
========================
Returns the content of the blob with the given name and type if it is
stored in the repository, "404 not found" otherwise.
If the request specifies a partial read with a Range header field, then
the status code of the response is 206 instead of 200 and the response
only contains the specified range.
Response format: binary/octet-stream
POST {path}/{type}/{name}
=========================
Saves the content of the request body as a blob with the given name and
type, an HTTP error otherwise.
Request format: binary/octet-stream
DELETE {path}/{type}/{name}
===========================
Returns "200 OK" if the blob with the given name and type has been
deleted from the repository, an HTTP error otherwise.
*****
Talks
*****
The following talks will be or have been given about restic:
- 2016-01-31: Lightning Talk at the Go Devroom at FOSDEM 2016,
Brussels, Belgium
- 2016-01-29: `restic - Backups mal
richtig <https://media.ccc.de/v/c4.openchaos.2016.01.restic>`__:
Public lecture in German at `CCC Cologne
e.V. <https://koeln.ccc.de>`__ in Cologne, Germany
- 2015-08-23: `A Solution to the Backup
Inconvenience <https://programm.froscon.de/2015/events/1515.html>`__:
Lecture at `FROSCON 2015 <https://www.froscon.de>`__ in Bonn, Germany
- 2015-02-01: `Lightning Talk at FOSDEM
2015 <https://www.youtube.com/watch?v=oM-MfeflUZ8&t=11m40s>`__: A
short introduction (with slightly outdated command line)
- 2015-01-27: `Talk about restic at CCC
Aachen <https://videoag.fsmpi.rwth-aachen.de/?view=player&lectureid=4442#content>`__
(in German)

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design.rst

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.. toctree:: .. toctree::
:maxdepth: 2 :maxdepth: 2
installation 010_introduction
manual 020_installation
030_preparing_a_new_repo
040_backup
045_working_with_repos
050_restore
060_forget
070_encryption
080_examples
090_participating
100_references
faq faq
tutorials manual_rest
development
references
talks
.. include:: ../README.rst

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Installation
============
Packages
--------
Mac OS X
~~~~~~~~~
If you are using Mac OS X, you can install restic using the
`homebrew <http://brew.sh/>`__ package manager:
.. code-block:: console
$ brew tap restic/restic
$ brew install restic
Arch Linux
~~~~~~~~~~
On `Arch Linux <https://www.archlinux.org/>`__, there is a package called ``restic-git`` which can be
installed from AUR, e.g. with ``pacaur``:
.. code-block:: console
$ pacaur -S restic-git
Nix & NixOS
~~~~~~~~~~~
If you are using `Nix <https://nixos.org/nix/>`__ or `NixOS <https://nixos.org/>`__
there is a package available named ``restic``.
It can be installed uisng ``nix-env``:
.. code-block:: console
$ nix-env --install restic
Pre-compiled Binary
-------------------
You can download the latest pre-compiled binary from the `restic release
page <https://github.com/restic/restic/releases/latest>`__.
From Source
-----------
restic is written in the Go programming language and you need at least
Go version 1.8. Building restic may also work with older versions of Go,
but that's not supported. See the `Getting
started <https://golang.org/doc/install>`__ guide of the Go project for
instructions how to install Go.
In order to build restic from source, execute the following steps:
.. code-block:: console
$ git clone https://github.com/restic/restic
[...]
$ cd restic
$ go run build.go
You can easily cross-compile restic for all supported platforms, just
supply the target OS and platform via the command-line options like this
(for Windows and FreeBSD respectively):
::
$ go run build.go --goos windows --goarch amd64
$ go run build.go --goos freebsd --goarch 386
The resulting binary is statically linked and does not require any
libraries.
At the moment, the only tested compiler for restic is the official Go
compiler. Building restic with gccgo may work, but is not supported.

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Manual
======
Usage help
----------
Usage help is available:
.. code-block:: console
$ ./restic --help
restic is a backup program which allows saving multiple revisions of files and
directories in an encrypted repository stored on different backends.
Usage:
restic [command]
Available Commands:
autocomplete Generate shell autocompletion script
backup Create a new backup of files and/or directories
cat Print internal objects to stdout
check Check the repository for errors
dump Dump data structures
find Find a file or directory
forget Remove snapshots from the repository
help Help about any command
init Initialize a new repository
key Manage keys (passwords)
list List items in the repository
ls List files in a snapshot
mount Mount the repository
prune Remove unneeded data from the repository
rebuild-index Build a new index file
restore Extract the data from a snapshot
snapshots List all snapshots
tag Modify tags on snapshots
unlock Remove locks other processes created
version Print version information
Flags:
--json set output mode to JSON for commands that support it
--no-lock do not lock the repo, this allows some operations on read-only repos
-p, --password-file string read the repository password from a file
-q, --quiet do not output comprehensive progress report
-r, --repo string repository to backup to or restore from (default: $RESTIC_REPOSITORY)
Use "restic [command] --help" for more information about a command.
Similar to programs such as ``git``, restic has a number of
sub-commands. You can see these commands in the listing above. Each
sub-command may have own command-line options, and there is a help
option for each command which lists them, e.g. for the ``backup``
command:
.. code-block:: console
$ ./restic backup --help
The "backup" command creates a new snapshot and saves the files and directories
given as the arguments.
Usage:
restic backup [flags] FILE/DIR [FILE/DIR] ...
Flags:
-e, --exclude pattern exclude a pattern (can be specified multiple times)
--exclude-file string read exclude patterns from a file
--files-from string read the files to backup from file (can be combined with file args)
-f, --force force re-reading the target files/directories. Overrides the "parent" flag
-x, --one-file-system Exclude other file systems
--parent string use this parent snapshot (default: last snapshot in the repo that has the same target files/directories)
--stdin read backup from stdin
--stdin-filename string file name to use when reading from stdin
--tag tag add a tag for the new snapshot (can be specified multiple times)
--time string time of the backup (ex. '2012-11-01 22:08:41') (default: now)
Global Flags:
--json set output mode to JSON for commands that support it
--no-lock do not lock the repo, this allows some operations on read-only repos
-p, --password-file string read the repository password from a file
-q, --quiet do not output comprehensive progress report
-r, --repo string repository to backup to or restore from (default: $RESTIC_REPOSITORY)
Subcommand that support showing progress information such as ``backup``,
``check`` and ``prune`` will do so unless the quiet flag ``-q`` or
``--quiet`` is set. When running from a non-interactive console progress
reporting will be limited to once every 10 seconds to not fill your
logs.
Additionally on Unix systems if ``restic`` receives a SIGUSR signal the
current progress will written to the standard output so you can check up
on the status at will.
Manage tags
-----------
Managing tags on snapshots is done with the ``tag`` command. The
existing set of tags can be replaced completely, tags can be added to
removed. The result is directly visible in the ``snapshots`` command.
Let's say we want to tag snapshot ``590c8fc8`` with the tags ``NL`` and
``CH`` and remove all other tags that may be present, the following
command does that:
.. code-block:: console
$ restic -r /tmp/backup tag --set NL --set CH 590c8fc8
Create exclusive lock for repository
Modified tags on 1 snapshots
Note the snapshot ID has changed, so between each change we need to look
up the new ID of the snapshot. But there is an even better way, the
``tag`` command accepts ``--tag`` for a filter, so we can filter
snapshots based on the tag we just added.
So we can add and remove tags incrementally like this:
.. code-block:: console
$ restic -r /tmp/backup tag --tag NL --remove CH
Create exclusive lock for repository
Modified tags on 1 snapshots
$ restic -r /tmp/backup tag --tag NL --add UK
Create exclusive lock for repository
Modified tags on 1 snapshots
$ restic -r /tmp/backup tag --tag NL --remove NL
Create exclusive lock for repository
Modified tags on 1 snapshots
$ restic -r /tmp/backup tag --tag NL --add SOMETHING
No snapshots were modified
Under the hood
--------------
Browse repository objects
~~~~~~~~~~~~~~~~~~~~~~~~~
Internally, a repository stores data of several different types
described in the `design
documentation <https://github.com/restic/restic/blob/master/doc/Design.rst>`__.
You can ``list`` objects such as blobs, packs, index, snapshots, keys or
locks with the following command:
.. code-block:: console
$ restic -r /tmp/backup list snapshots
d369ccc7d126594950bf74f0a348d5d98d9e99f3215082eb69bf02dc9b3e464c
The ``find`` command searches for a given
`pattern <http://golang.org/pkg/path/filepath/#Match>`__ in the
repository.
.. code-block:: console
$ restic -r backup find test.txt
debug log file restic.log
debug enabled
enter password for repository:
found 1 matching entries in snapshot 196bc5760c909a7681647949e80e5448e276521489558525680acf1bd428af36
-rw-r--r-- 501 20 5 2015-08-26 14:09:57 +0200 CEST path/to/test.txt
The ``cat`` command allows you to display the JSON representation of the
objects or its raw content.
.. code-block:: console
$ restic -r /tmp/backup cat snapshot d369ccc7d126594950bf74f0a348d5d98d9e99f3215082eb69bf02dc9b3e464c
enter password for repository:
{
"time": "2015-08-12T12:52:44.091448856+02:00",
"tree": "05cec17e8d3349f402576d02576a2971fc0d9f9776ce2f441c7010849c4ff5af",
"paths": [
"/home/user/work"
],
"hostname": "kasimir",
"username": "username",
"uid": 501,
"gid": 20
}
Metadata handling
~~~~~~~~~~~~~~~~~
Restic saves and restores most default attributes, including extended attributes like ACLs.
Sparse files are not handled in a special way yet, and aren't restored.
The following metadata is handled by restic:
- Name
- Type
- Mode
- ModTime
- AccessTime
- ChangeTime
- UID
- GID
- User
- Group
- Inode
- Size
- Links
- LinkTarget
- Device
- Content
- Subtree
- ExtendedAttributes
Scripting
---------
Restic supports the output of some commands in JSON format, the JSON
data can then be processed by other programs (e.g.
`jq <https://stedolan.github.io/jq/>`__). The following example
lists all snapshots as JSON and uses ``jq`` to pretty-print the result:
.. code-block:: console
$ restic -r /tmp/backup snapshots --json | jq .
[
{
"time": "2017-03-11T09:57:43.26630619+01:00",
"tree": "bf25241679533df554fc0fd0ae6dbb9dcf1859a13f2bc9dd4543c354eff6c464",
"paths": [
"/home/work/doc"
],
"hostname": "kasimir",
"username": "fd0",
"uid": 1000,
"gid": 100,
"id": "bbeed6d28159aa384d1ccc6fa0b540644b1b9599b162d2972acda86b1b80f89e"
},
{
"time": "2017-03-11T09:58:57.541446938+01:00",
"tree": "7f8c95d3420baaac28dc51609796ae0e0ecfb4862b609a9f38ffaf7ae2d758da",
"paths": [
"/home/user/shared"
],
"hostname": "kasimir",
"username": "fd0",
"uid": 1000,
"gid": 100,
"id": "b157d91c16f0ba56801ece3a708dfc53791fe2a97e827090d6ed9a69a6ebdca0"
}
]
Temporary files
---------------
During some operations (e.g. ``backup`` and ``prune``) restic uses
temporary files to store data. These files will, by default, be saved to
the system's temporary directory, on Linux this is usually located in
``/tmp/``. The environment variable ``TMPDIR`` can be used to specify a
different directory, e.g. to use the directory ``/var/tmp/restic-tmp``
instead of the default, set the environment variable like this:
.. code-block:: console
$ export TMPDIR=/var/tmp/restic-tmp
$ restic -r /tmp/backup backup ~/work
Caching
-------
Restic keeps a cache with some files from the repository on the local machine.
This allows faster operations, since meta data does not need to be loaded from
a remote repository. The cache is automatically created, usually in the
directory ``.cache/restic`` in the user's home directory. The environment
variable ``XDG_CACHE_DIR`` or the command line parameter ``--cache-dir`` can
each be used to specify where the cache is located. The parameter
``--no-cache`` disables the cache entirely. In this case, all data is loaded
from the repo.
The cache is ephemeral: When a file cannot be read from the cache, it is loaded
from the repository.

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==========
References
==========
.. include:: design.rst
------------------------
.. include:: rest_backend.rst
------------------------
.. include:: cache.rst

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REST Backend
============
Restic can interact with HTTP Backend that respects the following REST
API. The following values are valid for ``{type}``: ``data``, ``keys``,
``locks``, ``snapshots``, ``index``, ``config``. ``{path}`` is a path to
the repository, so that multiple different repositories can be accessed.
The default path is ``/``.
POST {path}?create=true
-----------------------
This request is used to initially create a new repository. The server
responds with "200 OK" if the repository structure was created
successfully or already exists, otherwise an error is returned.
DELETE {path}
-------------
Deletes the repository on the server side. The server responds with "200
OK" if the repository was successfully removed. If this function is not
implemented the server returns "501 Not Implemented", if this it is
denied by the server it returns "403 Forbidden".
HEAD {path}/config
------------------
Returns "200 OK" if the repository has a configuration, an HTTP error
otherwise.
GET {path}/config
-----------------
Returns the content of the configuration file if the repository has a
configuration, an HTTP error otherwise.
Response format: binary/octet-stream
POST {path}/config
------------------
Returns "200 OK" if the configuration of the request body has been
saved, an HTTP error otherwise.
GET {path}/{type}/
------------------
Returns a JSON array containing the names of all the blobs stored for a
given type.
Response format: JSON
HEAD {path}/{type}/{name}
-------------------------
Returns "200 OK" if the blob with the given name and type is stored in
the repository, "404 not found" otherwise. If the blob exists, the HTTP
header ``Content-Length`` is set to the file size.
GET {path}/{type}/{name}
------------------------
Returns the content of the blob with the given name and type if it is
stored in the repository, "404 not found" otherwise.
If the request specifies a partial read with a Range header field, then
the status code of the response is 206 instead of 200 and the response
only contains the specified range.
Response format: binary/octet-stream
POST {path}/{type}/{name}
-------------------------
Saves the content of the request body as a blob with the given name and
type, an HTTP error otherwise.
Request format: binary/octet-stream
DELETE {path}/{type}/{name}
---------------------------
Returns "200 OK" if the blob with the given name and type has been
deleted from the repository, an HTTP error otherwise.

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Talks
=====
The following talks will be or have been given about restic:
- 2016-01-31: Lightning Talk at the Go Devroom at FOSDEM 2016,
Brussels, Belgium
- 2016-01-29: `restic - Backups mal
richtig <https://media.ccc.de/v/c4.openchaos.2016.01.restic>`__:
Public lecture in German at `CCC Cologne
e.V. <https://koeln.ccc.de>`__ in Cologne, Germany
- 2015-08-23: `A Solution to the Backup
Inconvenience <https://programm.froscon.de/2015/events/1515.html>`__:
Lecture at `FROSCON 2015 <https://www.froscon.de>`__ in Bonn, Germany
- 2015-02-01: `Lightning Talk at FOSDEM
2015 <https://www.youtube.com/watch?v=oM-MfeflUZ8&t=11m40s>`__: A
short introduction (with slightly outdated command line)
- 2015-01-27: `Talk about restic at CCC
Aachen <https://videoag.fsmpi.rwth-aachen.de/?view=player&lectureid=4442#content>`__
(in German)

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==========
Tutorials
==========
.. include:: tutorial_aws_s3.rst