On volumes that are RAW or formatted FAT32 the snapshot cache location cannot be located on the same volume that is being backed up.
When the snapshot cache location is located on the same volume that is being backed up the volume must be formatted with NTFS. The default cache location is on the same volume where the snapshot is being performed.
The client does not execute the image snapshot backup operation.
Specify a different snapshot cache location using the SNAPSHOTCACHELOCATION option.