If a backup job is stopped or fails while a VSS snapshot is being used, the plug-in might not clean up the VSS snapshot. If this issue occurs, you can use a tool such as Microsoft CLI diskshadow.exe to remove the snapshot.
| 1  | After DiskShadow is run from a command line with elevated permissions, run the following command at the DISKSHADOW> prompt to find and remove the orphaned shadow copy. | 
| 2  | Look through the list of shadow copies noting the Exposed Locally as field. | 
| 4  | Using the Shadow copy ID field from that entry, run the following command: | 
| 5  | Navigate to <installationDirectory>\tmp\Hyper-V, and delete the directory with the VM name used during the stopped or failed job. | 
| 8  | If a VSS Writer is listed in a State other than Stable, use Hyper-V Manager to select the host node, and stop and start the Virtual Machine Manager service. | 
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