My primary HD is shown as a 'Backup Disk' in Time Machine . . .

I was a longtime user of SuperDuper and want to try Time Machine.
Is the primary hard drive (mine called Prime) supposed to show up as a 'backup disk' in the Time Machine preferences?
See image:
I want to back up to two other hard drives, Time Machine (On Site), and USB Back-Up. How does one identify the disk to be backed up? Does Time Machine default to the one containing the active system?
Thanks.

Hi Edward,
From the screenshot, it looks like you have 3 active backup disks.  This article has some information on using multiple disks for backup:
OS X Mountain Lion: Use multiple backup disks
http://support.apple.com/kb/PH11452
Time Machine rotates the backup schedule among the disks. For each backup disk, Time Machine backs up everything that’s changed since the last time that backup disk was used. If you’ve clicked Options in Time Machine preferences and designated items that should not be backed up, the list of excluded items applies to all backup disks.
Additionally, here's some info on the disks that can be used with Time Machine:
OS X Mountain Lion: Disks you can use with Time Machine
http://support.apple.com/kb/PH11171
I hope this helps!
- Ari

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