Exchange DAG client parallelism

Hi,

We have an Exchange group configured with the dag client to backup Exchange App.

When the backups starts the cpu load in the servers is very high and we need to decrease the client parallelism.

We have change client parallelism from 4 (default) to 1 in the dag client, but the number of save set running at the same time seems the same.

How can decrease parallelism of Exchange save sets?

Thanks.