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add FAQ about removing old files and policies

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This has been asked twice already this year:

https://mail.python.org/pipermail/borgbackup/2017q3/000796.html
https://mail.python.org/pipermail/borgbackup/2017q4/000891.html

... and I was asked again privately today, so this qualifies as FAQ to
me.
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Antoine Beaupré 2017-11-18 09:08:37 -05:00
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docs/faq.rst
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@ -296,6 +296,34 @@ the archive, compacting the segments, and committing the repo & cache. This mean
when Borg is run with e.g. the ``time`` command, the duration shown in the archive
stats may be shorter than the full time the command runs for.
How do I configure different prune policies for different directories?
----------------------------------------------------------------------
Say you want to prune ``/var/log`` faster than the rest of
``/``. How do we implement that? The answer is to backup to different
archive *names* and then implement different prune policies for
different prefixes. For example, you could have a script that does::
borg create $REPOSITORY:main-$(date +%Y-%m-%d) --exclude /var/log /
borg create $REPOSITORY:logs-$(date +%Y-%m-%d) /var/log
Then you would have two different prune calls with different policies::
borg prune --verbose --list -d 30 --prefix main- "$REPOSITORY"
borg prune --verbose --list -d 7 --prefix logs- "$REPOSITORY"
This will keep 7 days of logs and 30 days of everything else. Borg 1.1
also supports the ``--glob-archives`` parameter.
How do I remove files from an existing backup?
----------------------------------------------
Say you now want to remove old logfiles because you changed your
backup policy as described above. The only way to do this is to use
the :ref:`borg_recreate` command to rewrite all archives with a
different ``--exclude`` pattern. See the examples in the
:ref:`borg_recreate` manpage for more information.
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