VM backups.....Better efficiency?

Netbackup 7.5.0.4

Windows 2008 master and media servers

DataDomain backup target, DDOS 5.4.1.1

Hi all,

In my environment, there are approx 1100 virtual servers. The way I am backing these up, is through multiple vm policies (approximately 12), selected by DatacenterName, VCenterName, and VMFoldername using the VM query, and then staggering the backup schedule kickoff times. My question is, is it better to do it this way, or pretty much have them all under one big policy, and limit number of jobs per policy, etc? Just wondering what others are doing to efficiently back up many vm's. I'm on 7.5.0.4, so not yet using anything like Accelerator for VMware.

Thank you!

Todd