Business Critical VM backup Designing

HI,

I am configuring backup of Microsoft Exchange which is running on a VM in vSphere 5.0 environment. Backup software is Symantec BackupExec and this is backup over LAN through agent. Virtual Machine have 1 NIC. I need to ask that how can i make my Exchnage's backup efficient, because single and 1G NIC of VM is main bottleneck for me. Any suggestions for teaming or dedicated NIC for backup etc.

Thanks in advance!

Regards,

Kaashif