[ovirt-users] Cannot Enable incremental backup

Hello all I'm trying to create incremental backups for my VMs on a testing cluster and am using the functions from https://gitlab.com/nirs/ovirt-stress/-/blob/master/backup/backup.py. So far it works well, but on some disks it is not possible to enable incremental backups even when the VM is powered off (see screenshot below). Does anyone know why this might be the case and how to activate it? I think I already checked the docs and didn't find anything but feel free to nudge me in the right direction. By the way, is there a backup solution that is somewhat endorsed by the community here? Thank you and kind regards, Jonas Screenshot of oVirt Disk