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Add warning of the performance of prune

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I went pretty loud with this, but I think the performance is bad enough
that it's really worth highlighting, especially since it locks the index
during the prune.
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Mike Lissner 2018-07-31 13:15:27 -07:00 committed by Alexander Neumann
parent 3151978f58
commit 2caf8edc55
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doc/060_forget.rst
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@ -23,6 +23,13 @@ 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.
.. Warning::
Pruning snapshots can be a very time-consuming process, taking nearly
as long as backups themselves. During a prune operation, the index is
locked and backups cannot be completed. Performance improvements are
planned for this feature.
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.