Vmware Backup

Hello Experts,

We have been planning to install vmsnapshot backups in our testing department. So we need to know whether we need to install nbu client on vcenter server.

Or just need to put vcenter credentials on Virtual machine servers? 

We would be taking snapshot backup from vmhost machine

We are using Netbackup 7.6.0.1 and OS Windows 2008 R2

Vcenter Version:- 5.5

Thanks,