Hi all, I'm trying to experiment with incremental backup using the example script provided on sdk git page (https://github.com/oVirt/ovirt-engine-sdk/blob/master/sdk/examples/backup_vm...). I installed a fresh engine on a CentOS 8 VM and installed a fresh node on CentOS 8 as well, connected to the engine without any problems. All libvirt packages version 5.6 and ovirt-imageio-common version 2.0.3 . Passing all the needed args to the script (I hardcoded connections var like user and password) it throws the following error: ``` [root@centos8 ~]# python3 backup_vm.py full --engine-url https://ovirt-engine-fqdn.com --username admin@internal --password-file ./passwd --backup-dir /home 11d70eb0-4d7c-4308-82a6-470e21d80ecd [ 0.0 ] Starting full backup for vm 11d70eb0-4d7c-4308-82a6-470e21d80ecd Traceback (most recent call last): File "backup_vm.py", line 397, in <module> main() File "backup_vm.py", line 141, in main args.command(args) File "backup_vm.py", line 154, in cmd_full backup = start_backup(connection, args) File "backup_vm.py", line 247, in start_backup disks=disks File "/usr/lib64/python3.6/site-packages/ovirtsdk4/services.py", line 33583, in add return self._internal_add(backup, headers, query, wait) File "/usr/lib64/python3.6/site-packages/ovirtsdk4/service.py", line 232, in _internal_add return future.wait() if wait else future File "/usr/lib64/python3.6/site-packages/ovirtsdk4/service.py", line 55, in wait return self._code(response) File "/usr/lib64/python3.6/site-packages/ovirtsdk4/service.py", line 229, in callback self._check_fault(response) File "/usr/lib64/python3.6/site-packages/ovirtsdk4/service.py", line 132, in _check_fault self._raise_error(response, body) File "/usr/lib64/python3.6/site-packages/ovirtsdk4/service.py", line 118, in _raise_error raise error ovirtsdk4.Error: Fault reason is "Operation Failed". Fault detail is "[Cannot backup VM. Backup is not supported by the host (centos8).]". HTTP response code is 409. ``` The VM is created from centOS 7 template imported from ovirt-image-repository, and the options "Enable Incremental Backup" on the disk is ticked. I'm definitely missing something... But what? On the top of the script, I read "Using this example requires a special libvirt version supporting incremental backup.". Which version of libvirt? I guessed the 5.6 (or at least not the 4.5 shipped in CentOS 7). Thank you for your time and help, Francesco