Veeam Warning Error during backups:
Failed to prepare guest for hot backup. Details: VSSControl: -xxxxxx Backup job failed. Cannot create a shadow copy of the volumes containing writer's data. VSS asynchronous operation is not completed. Operation: [Shadow copies commit. Code: [0x8004231f.
This warning is usually a sign of low disk space on the Guest OS.
If this is a Windows OS we recommend installing TreeView and mapping out the disk space usage to clear down some unnecessary files.