Backupexec DFS-R issue

Hello,

Our client is using DFS-R on Windows Server 2008R2.

We perform full backup's of three DFS machines in the customer's environment through Shadow Copy Component.
Customer registered thet DFS Replication stops and combines it with the backup / restore of DFS machines.

The client requires clarification.
How backupexec'a agent affects the DFS service?
Does it stop at the time the snapshot, or for the duration of the entire backup job, and maybe quite "hot".
Is it possible to stop the replication of the backup and did not get up?

Thanks for help.

Greetings

Marcin