Extremely slow Exchange 2003 backups with Netbackup 7.1.0.3

Hello, 

I am getting extremely slow backups of my exchange mailboxes using Netbackup.  They are backing up at rougle .075 mb/sec, the istores are backing up correctly at rought 22mb/sec.  

Yes, I do have to do individual mailbox backups, they are split up into multiple policies (i.e. xchange_mailboxes_a-c), they do have multiple data streams selected and a being compressed.  Is there any other setting I can change to get a little bit quicker speed?  I'd be ok with getting 1 mb/sec but I'm not even getting that.  

Thanks!