If you use DataRecovery for Backups you should check the settings of the DR-Appliance.
The virtual disk of your VM could exist as further HDD in your DR-Appliance after a failed backup.
- Shutdown DR-Appliance
- Remove the additional virtual disk (VM) from the DR-Appliance (-> remove from virtual machine)
- Restart DR-Appliance
- Consolidate all Snapshots for the VM