Priority between prune schedules


New Member
Sep 20, 2021
Hi everyone,

i'm trying to deal with a project issue, in particular, prune/GC schedule for two different groups of VM, giving you a couple of data:

Group A: 1 backup every 24h, data retention A scheduled via PBS
Group B: 1 backup every hour, data retention B scheduled via cron script (better explanation in further lines)

Only one datastore on PBS (and available on hardware) where both Group A and B backups are saved

I've managed to use the GUI (both PVE and PBS) for Group A, and all is working as intended.
For Group B (following several posts in this forum) i've put a script in /etc/pve called mybackups.cron, with a link in /etc/cron.d, and the backups are ok, but I'd like to have a different data retention than the one set up on my PBS for Group A

If I specify a different data retention in the mybackups.cron, will this override the one I've scheduled in my PBS for the datastore i put both the groups in?

example: "19 * * * * root vzdump --prune-backups keep-last=24,keep-daily=11,keep-weekly=6,keep-monthly=6,keep-yearly=1 [id1]...[idN] --mode snapshot --mailto [...]"

Many thanks in advance!


Proxmox Staff Member
Staff member
Aug 1, 2019
if there is a prune schedule on the PBS side, it will affect all backups on the datastore. If there are custom prune options on the PVE side, those will be used as well (for each backup group individually, after each new backup is taken). So effectively, the more aggressive retention wins.

You can either use two datastores or only configure pruning on the PVE side.


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