policy throttling

Is there a way in Netbackup 7.5.0.5 to policy throttling?

I have to duplicate some info backup up on a NAS that is offsite.

I need to duplicate the data to tape for a couple of reason and I am trying to figure out the best way to so this.

I was thinking if I could policy throttling this backup so durning the day it has low bandwith, and then at night I can give it 75% of the line so we are not taking over the network.  

The plant this NSA is at runs 3 shifts but at night most everyone there is a line worker so WAN speed isn't a issue.  

Master/Media is a Windows 2008 running netbackup 7.5.0.5.  

Any thoughs or help would be great.

Thanks