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[Jean-Peer Lorenz <question138633@xxxxxxxxxxxxxxxxxxxxx>]

Question #138633 on Simple Backup changed:
https://answers.launchpad.net/sbackup/+question/138633

Jean-Peer Lorenz proposed the following answer:
Snapshots get only purged (logarithmic plan or simple cut-off) in the
case they are _standalone_ (i.e. other snapshots do not depend on them).
Purpose is to keep incremental and full snapshots consistent. Rebasing
of incremental snapshots as in former releases (nssbackup before 0.2.0,
sbackup before 0.11) is completely dropped since it is a severe risk to
the backuped data.

Version SBackup 0.11 introduced a slight modification of the logarithmic purge plan:
* keep all from yesterday
* keep one per day from last week
* keep one per week from last month
* keep one per month from last year
* keep one per quarter from 2nd last year
* keep one per year further into past

Read 'keep one' as 'keep at least one'.

Example: making a full backup every 30 days means purging of snapshots
will be possible not before 30 days after the first snapshot because
every snapshot in your archive relies on the other (except the latest
but this one is also kept because it's the latest ;-) until you create
another full snapshot.

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