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Merge pull request #957 from middelink/fix-953

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Change backup policy to be inclusive
This commit is contained in:
Alexander Neumann
2017-05-15 17:19:04 +02:00
parent 13c12ca83d 7fffd408af
commit 13393c76dc
15 changed files with 122 additions and 315 deletions
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doc/manual.rst
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@@ -788,6 +788,9 @@ 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.
@@ -796,6 +799,14 @@ 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.
Autocompletion
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