Error Message 10103

Failed to take VSS snapshot. System error=[<parameter>].

Symptom

Encountered system error when taking VSS snapshot for backup.

Solution

Check errors in Windows event message under Microsoft -> Windows -> Hyper-V-VMMS -> Admin in both Hyper-V host and guest OS. Or check the backup job log and stub log to get more information. One reason for this message could be a source volume, which is 64 TB or larger. This size is above the Microsoft limit for VSS snapshot functionality. If the data on the volume allows it, shrinking the volume from the Microsoft Disk Management to a partition size below 63.9 TB would allow VSS snapshots to work.