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Hyper- V Cluster is not supported for backup with the current version of Vembu BDR Suite but the above-mentioned issue is not related with the Hyper-V cluster and it seems to be there is an issue in creating Hyper-V snapshot for the VMs configured for backup.

To analyze further, try creating a manual snapshot by running the following commands and send us the output of the manual snapshot in a text file along with the above-mentioned environment details to vembu-support@vembu.com

Manual snapshots cannot be created from the UI of Hyper-V Server, Use the following steps to create the manual snapshot

1. Open Command Prompt as Administrator
2. Type “diskshadow” and enter
3. Type “set context persistent” and enter
4. Typer “set verbose on” and enter
5. Type “begin backup” and enter
6. Type “add volume <volume1>” and enter (Note: If the disk path is C:\disk.vhdx then the command will be “add volume c:\”. Repeat this step if you have multiple disks in different paths)
7. Type “create” and enter.
8. Type "end backup" and enter

Refer the following screenshot while creating the manual snapshot.