Disaster Recovery: X drive is detected as a critical volume but cannot be included in the savesets

Conflict with drive letter X: because the drive letter X: is used by the WinPE image as the system drive. This creates a conflict with any critical volume that uses the drive letter X:

If a critical volume uses the drive letter X:, the disaster recovery backup will fail with error message:

Disaster Recovery: X drive is detected as a critical volume but cannot be included in the savesets.

To remedy the situation, Change the Drive letter to any other letter rather than X: ( as an example assign B: as a drive letter instead of X:)