I've decided to start using SuperDuper for backing up my iMac rather than using Time Machine. What is the proper procedure for getting rid of the Time Machine backup on my Mediasmart Server?

You need to:
- go to Time Machine pref pane and stop it
- go to "Backup" tab in HP Control Center (or PrefPane, depending on the software version), and there
- - click "Stop" button, to deactivate backup disk
- - click "Gear" button and select "Delete" from the drop-down menu
- - click OK in the sheet to confirm your intention

That's it.

thanks, worked like a charm !