Sorry. The thread became separated. Yeah. I finished the migration. Simone proposed I had a corrupted backup. And yes. I was backtracking my backups to that point where I switched all datacenters to 4.3 compatibility and before doing any engine migration. Lucky me, I had that backup available. I think my backups became corrupted, because I did a backup from the engine after I moved it to a cluster that was originally not defined. I had a typo in the cluster name. And used that backup and tried to get the engine back to my nfs storage. That worked. I did another backup at that place again and from that point on the backup would always break the deployment for whatever reason. The logs are available at https://lists.ovirt.org/archives/list/users@ovirt.org/thread/HXJZWN7L6WXSDLQ...