Full backup after moving VM ?

andrew wrigley

New Member
Sep 20, 2023
I am new to Proxmox, so this might be an known issue.

But if I move a VM to a new host, the backups see this as a new VM, and so do a full backup (rather than the incremental backup scheduled).

Is this by design ? can this behaviour be altered ??

what exactly do you mean by "move"? if you do a live migration, the bitmap should be preserved and the backup should still use fast incremental mode. otherwise, if the VM has been stopped since the last backup, it should use "slow" incremental mode (where each chunk of source data has to be read to determine whether it has changed). if you cloned/restored the VM into a new VMID, then there will be no "link" to the previous backups, but the chunks are still only stored once (the server will take care of that, but they will be unnecessarily uploaded).
please post the migration task log, as well as the one from the backup directly after


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