Type of backups in clustered Hyper-V

Hello everyone.

I am going to back up a clustered Hyper-V environment.

We are using CSV and the cluster-aware backup is our choice.

NetWorker 8.2.1

In the documentation in the "Configuring backups" section I have found the attribute NSR_VSS_FULL_BACKUP (Performs VSS FULL or VSS COPY backups in guest VMs. By default, all Hyper-V VM backups are VSS COPY type).

But I have not found the difference between those two variants.

Could someone please explain me that? When should I use VSS FULL?

Maybe it is not relevant to me because I will not plan to do a backup from inside VMs (databases are exceptions).

Thanks a lot.