Time Machine naming issues

I had to go back to the office last night and replace a failed sparsebundle for one of the production computers.  Somehow, it had corrupted (Google “error 109″) and then it got deleted.  I’m not sure how that happened.  TimeMachine kept trying to create a new sparsebundle on the Drobo and failing.
I still use the instructions I had from before, but with one important difference.  networksetup -getcomputername can have a different value from the actual machine name.  It turns out TimeMachine will create a sparsebundle with the value it finds with networksetup -getcomputername, but it looks for a sparsebundle with the machine name first.  That I got from the terminal app prompt:

17300x: 19900iMac$

so the sparsebundle needs to be named

19900iMac_000000000000.sparsebundle

where the bunch of 0′s are the MAC address.  I tried using the computer name, but TimeMachine wouldn’t see it and kept trying to create its own.