Why Vss Is Required?
Vss Coordinates the Actions That Are Required to Create a Consistent Shadow Copy (Also Known as a Snapshot or a Point-in-Time Copy) of the Data That Is to Be...
VSS coordinates the actions that are required to create a consistent shadow copy (also known as a snapshot or a point-in-time copy) of the data that is to be backed up. The shadow copy can be used as-is, or it can be used in scenarios such as the following: ... You are performing disk-to-disk backups.
Why is VSS needed?
VSS is smart enough to keep track of its temporary storage location, and will exclude anything in it, including the current temporary storage area and any persistent snapshots that have been previously created. So when the data is read by your backup software, you only get what you need.
Should I disable VSS?
It is not recommended to turn off Volume Shadow Copy. It manages and implements Volume Shadow Copies used for backup and other purposes. If this service is stopped, shadow copies will be unavailable for backup and the backup may fail.