How to back up Netbackup 7.5 master virtual machine

Hi,

We have Netbackup catalog backups running every night on our Netbackup master vm (NB7.5.0.6 Win 2008 R2) but we don't do an actual OS backup. I'm vaguely concerned that if we do a VM backup with a snapshot that this might impact on Netbackup somehow. Can someone advise?

Would it be better to configure a Netbackup file system backup using the backup client? The server is dedicated to Netbackup so there is no other data on there relating to any other systems. 

Thanks