Throttle BMR Backup

Hi,

I'm trying to throttle network bandwidth used by WSB when creating a BMR backup. Target is an iSCSI-Volume which is mounted on a server running DPM 2010.

I tried QoS settings through GPO for wbadmin.exe and wbengine.exe with no success.

Is there a way to throttle I/O and/or network bandwidth used by WSB?

Thanks,

Tom