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docs: add note about GFS (#6006) 

docs: add note about grandfather-father-son backup retention policy / rotation scheme
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Philip Waritschlager 2022-01-22 19:33:02 +00:00 committed by GitHub
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src/borg/archiver.py
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@ -4309,7 +4309,9 @@ class Archiver:
Important: Repository disk space is **not** freed until you run ``borg compact``.
This command is normally used by automated backup scripts wanting to keep a
certain number of historic backups.
certain number of historic backups. This retention policy is commonly referred to as
`GFS <https://en.wikipedia.org/wiki/Backup_rotation_scheme#Grandfather-father-son>`_
(Grandfather-father-son) backup rotation scheme.
Also, prune automatically removes checkpoint archives (incomplete archives left
behind by interrupted backup runs) except if the checkpoint is the latest