On Thu, Jul 7, 2022 at 12:40 AM Jonas <jonas(a)rabe.ch&gt; wrote: Note that the VM configuration is not backed up, so restoring requires creating a new VM with the restored disks. So far it works well, but on some disks it is not possible to enable It look like you try to enable incremental backup *after* the disk was created which is not possible if the disk is using raw format. I guess the disk is on file based storage (NFS, Glsuter) and thin volume on file based storage is using raw format by default. The way to fix this is to convert the disk to qcow2 format - this feature is available since ovirt 4.5.0, but it works only via the API/SDK. Here is and example code for converting disk format: https://github.com/oVirt/python-ovirt-engine-sdk4/blob/7c17fe326fc1b67ba5... The example is not finished and is still in review, but it should show how to use the API. Nir