Hi, This looks like a bug. We had a same issue with few VMs After Veeam support was involved they redirected us to Oracle as we use OLVM. There was in logs 2024-08-17 01:06:12.1818 00022 [4184461] WARN | [RhvBackupManager]: Failed to create incremental backup, fallback to full backup: RhevClient.Exceptions.RhevServerException: Cannot backup VM: Disk is locked. Please try again later. THe same error was with Vinchin.