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Re: [Question #138633]: How does the purge feature work?

To: nssbackup-team@xxxxxxxxxxxxxxxxxxx
From: Jean-Peer Lorenz <question138633@xxxxxxxxxxxxxxxxxxxxx>
Date: Sun, 02 Jan 2011 18:04:40 -0000
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Question #138633 on Simple Backup changed:
https://answers.launchpad.net/sbackup/+question/138633

    Status: Open => Answered

Jean-Peer Lorenz proposed the following answer:
>it isn't installed by default on a new Ubuntu 
Yes, that's right. And I don't know who decides this (I guess Canonical Ltd.).

>How does the purge feature work?
Basically, there are 2 distinct modes of 'Purge':
1. delete backups older than a specified number of days (cut-off)
2. progressive purge. It keeps progressively less backups into the past:
Keep all backups from yesterday
Keep one backup per day from last week
Keep one backup per week from last month
Keep one backup per month from last year
Keep one backup per quarter from 2nd last year
Keep one backup per year further into past.

In general, only standalone snapshots are removed, i.e. snapshots that
build the base of subsequent (incremental) snapshots are not removed.
This means your backups will always be complete, even with activated
purging.

Feel free to ask for more details.
Best regards - Jean-Peer.

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