I guess this is because DFSR is something were files enter and leave the system through the DFSR staging area while replicating with other members. There is also a special DFSR database keeping track of things. So only VSS can guarantee that you are ...
I can only second Lamotta. I still have some tests to perform, that thing with share-level backup in case this works was a nice hint, but we are struggling with DFSR since three Backup Exec versions on server 2008, too.
Let me add an interesting obse...