KB ID : 104053
Published : Nov. 30, 2018
Created : Nov. 30, 2018
Last Modified : June 9, 2020


This error occurs when a Hyper-V VM configured for backup has a differencing disk.

When is it Applicable

  1. If you are using Windows 2012 R2 or below version.
  2. If you are using Vembu BDR Suite 4.0.2 & below.

[Note: Backups of Hyper-V VMs with differencing disks are supported for Windows Server 2016 & above and if you are using Vembu BDR Suite 4.1.0 and above.]


For successful backup in Hyper-V VM with differencing disk follow one of the solutions below :

Solution 1:

  1. Upgrade Vembu BDR Backup Server to version 4.1.0 or above. Refer to the Vembu Software Update Guide for more details.

  2. Upgrade your Windows Hyper-V Machine (the host being backed up) to the Windows 2016 and above.

Solution 2:

The differencing disk of the VM configured for backup must be merged with its parent disk. Follow the steps below:

  1. Open Hyper-V Manager
  2. Select the VM and click the Edit Disk option on the Actions pane.
  3. Browse to the differencing disk location and click Next.
  4. Select Merge and choose “To the parent virtual hard disk”.
  5. Click Finish.
  6. Once the disk is merged, the backups job will continue as scheduled or you can manually click on the “Run now” option to run the backup job immediately.
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