"Discover data to back up" feature

Hi.

I got a question regarding the 'discover data to back up' feature that reports servers currently not backed up.

I'm getting false positives from windows XP clients, how do i blacklist certain hostnames while still keeping the feature turned on ?

The same applies for servers, i've removed the agent, i've removed it from BE but it still adds itself to BE backup & restore tab.

Its roughly 2 months until i can completely turn those 2 servers off and its bit annoying having it reappear and being notified :(

Thanks!

Regards/Daniel.