I recently booted back up my Mac Mini and decided to try out the software for Mac that come with the HP MediaSmart Server. Surprisingly, it worked really well.
The integration of the TimeMachine backup to the Home Server works. Simple as that. It just works. HP can get it right some times.
Here are some screenshots.
Update: I have since noticed that the Mac does not appear in the Computers & Backup tab in the Home Server Console. This is somewhat expected, but it would have been something extra that HP could have polished off to help the integration of the Mac to the Home Server.