Why are snapshots not pruned?

O

ocroquette

New Member
Feb 20, 2024
12
1
3
Hello everyone,

I am a new user and I cannot find out why my snapshots are not pruned. Here is a log that shows the issue. I do not understand why all snapshots of vm/100 between "vm/100/2024-01-24T21:00:01Z" and "vm/100/2024-02-06T11:00:03Z" are kept, for instance. They are out of the "daily" scope. Only one should be kept for weekly scope.
The backups are performed from a remote PVE, if it makes any difference.

Code: 
Proxmox
Backup Server 3.1-2
2024-02-20T11:09:29+02:00: prune job 'default-pve1-8085bc65-8314-4532-'
2024-02-20T11:09:29+02:00: Starting datastore prune on datastore 'pve1', root namespace, down to full depth
2024-02-20T11:09:29+02:00: retention options: --keep-hourly 24 --keep-daily 14 --keep-weekly 4 --keep-monthly 12
2024-02-20T11:09:29+02:00: Pruning group :"vm/103"
2024-02-20T11:09:29+02:00: keep vm/103/2024-01-24T21:00:17Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-01-25T21:00:21Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-01-26T21:00:17Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-01-27T21:00:14Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-01-28T21:00:23Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-01-29T21:00:16Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-01-30T21:00:16Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-01-31T21:00:12Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-01T21:00:17Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-02T21:00:15Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-03T21:00:15Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-04T21:00:21Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-05T21:00:17Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-06T11:00:18Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-06T13:00:22Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-06T15:00:30Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-06T17:00:19Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-06T19:00:18Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-06T21:00:16Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-06T23:00:20Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-07T01:00:14Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-07T03:00:13Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-07T05:00:13Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-07T07:00:17Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-07T09:00:16Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-07T11:00:14Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-07T13:00:18Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-08T02:00:15Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-08T10:55:29Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-13T02:00:32Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-14T02:00:16Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-15T02:00:16Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-16T02:00:16Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-17T02:00:32Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-18T02:00:16Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-19T02:00:16Z
2024-02-20T11:09:29+02:00: keep vm/103/2024-02-20T02:00:18Z
2024-02-20T11:09:29+02:00: Pruning group :"vm/100"
2024-02-20T11:09:29+02:00: keep vm/100/2024-01-24T21:00:01Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-01-26T21:00:04Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-01-27T21:00:02Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-01-28T21:00:07Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-01-29T21:00:00Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-01-30T21:00:03Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-01-31T21:00:00Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-01T21:00:02Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-02T21:00:00Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-03T21:00:01Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-04T21:00:06Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-05T21:00:02Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-06T11:00:03Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-06T13:00:04Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-06T15:00:04Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-06T17:00:04Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-06T19:00:04Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-06T21:00:04Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-06T23:00:05Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-07T01:00:00Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-07T03:00:01Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-07T05:00:00Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-07T07:00:01Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-07T09:00:01Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-07T11:00:01Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-07T13:00:01Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-08T02:00:00Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-08T10:55:15Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-13T02:00:04Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-14T02:00:01Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-15T02:00:02Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-16T02:00:01Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-17T02:00:00Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-18T02:00:03Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-19T02:00:02Z
2024-02-20T11:09:29+02:00: keep vm/100/2024-02-20T02:00:02Z
2024-02-20T11:09:29+02:00: Pruning group :"vm/102"
2024-02-20T11:09:29+02:00: keep vm/102/2024-01-24T21:00:12Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-01-25T21:00:12Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-01-26T21:00:12Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-01-27T21:00:08Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-01-28T21:00:18Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-01-29T21:00:11Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-01-30T21:00:11Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-01-31T21:00:08Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-01T21:00:12Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-02T21:00:11Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-03T21:00:10Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-04T21:00:16Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-05T21:00:12Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-06T11:00:13Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-06T13:00:16Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-06T15:00:15Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-06T17:00:14Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-06T19:00:13Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-06T21:00:11Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-06T23:00:15Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-07T01:00:09Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-07T03:00:07Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-07T05:00:08Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-07T07:00:11Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-07T09:00:11Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-07T11:00:09Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-07T13:00:13Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-08T02:00:10Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-08T10:55:24Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-13T02:00:23Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-14T02:00:11Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-15T02:00:11Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-16T02:00:11Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-17T02:00:27Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-18T02:00:11Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-19T02:00:11Z
2024-02-20T11:09:29+02:00: keep vm/102/2024-02-20T02:00:13Z
2024-02-20T11:09:29+02:00: Pruning group :"vm/101"
2024-02-20T11:09:29+02:00: keep vm/101/2024-01-24T21:00:07Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-01-25T21:00:06Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-01-26T21:00:07Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-01-27T21:00:04Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-01-28T21:00:13Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-01-29T21:00:06Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-01-30T21:00:06Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-01-31T21:00:02Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-01T21:00:07Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-02T21:00:05Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-03T21:00:05Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-04T21:00:12Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-05T21:00:07Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-06T11:00:08Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-06T13:00:06Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-06T15:00:10Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-06T17:00:09Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-06T19:00:07Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-06T21:00:07Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-06T23:00:10Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-07T01:00:04Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-07T03:00:02Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-07T05:00:03Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-07T07:00:06Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-07T09:00:05Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-07T11:00:04Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-07T13:00:08Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-08T02:00:04Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-08T10:55:19Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-13T02:00:07Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-14T02:00:05Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-15T02:00:06Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-16T02:00:06Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-17T02:00:07Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-18T02:00:06Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-19T02:00:05Z
2024-02-20T11:09:29+02:00: keep vm/101/2024-02-20T02:00:08Z
2024-02-20T11:09:29+02:00: TASK OK

Thanks for your help!
 
Hi,
keep-hourly 24 means "keep backups for 24 different hours". The next setting is then applied for backups that have not yet been considered by the keep-hourly setting. Then, keep-daily 14 means "keep backups for 14 different days". See https://pbs.proxmox.com/docs/prune-simulator/index.html for an explanation and to experiment with different settings.
 
Ah, now I get it, thank you. I did not realize that changing the settings of the "short" options push back the effect of the "longer" options. This means also that the periodicity of the snapshots has a big impact on the retention. More specifically, if the snapshot period is significantly longer than the prune intervals, things get weird. For instance, daily snapshots combined with --keep-hourly H --keep-daily D make it behave like --keep-daily (H+D).
I am more familiar with BorgBackup, which has a different interpretation, I believe, but I would have to double-check.
 
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