Backing up Win AD Servers

Hello,

We have 4 AD servers, 2 - 2003, and 2 - 2008 R2. The previous NBU admin set up backups in 2 policies, ALL_LOCAL_DRIVES.

I am curious if there is any special set-up procedures when backing up AD Servers different from a normal server backup policy?

We run Win NBU 7.5.0.3

thx