Thought this was kind of a cool function of Netbackup 7.5. It has the ability to post last good backup date to a vCenter custom attribute. Here is the article:
The short of it is to simply add the extensions (Register extension, Unregister extension, Update extension) permissions to your NBU role on top of those perms listed here:
configuring vmware advanced attributes in netbackup 7.5+.
<-- Pointed out by Michael in comments. Cause I forgot to add it. -->