Time Machine no longer can find my backup disk

Since the OSX 10.6.6 upgrade, I am unable to do a Time Machine backup on my MacBook Pro. It is on a network with my iMac which is connected via FireWire to my Drobo. I have never had a problem before with Time Machine being able to find the Sparsebundle that Time Machine sets up on a network connected drive. Now it gives me the message, "The identity of the backup disk has changed.". I tried deleting the Sparsebundle and then letting Time Machine start over. That worked, but the next rime it attempted to backup, I got the same error message.
I would appreciate any help.
Thanks -
Dudley Warner

Alton Christensen wrote:
- external drive on Airport Extreme
Sorry to have to tell you this, but backing-up that way is "iffy" and +*not supported by Apple.+* See [Using Time Machine with an Airport Extreme Air Disk|http://web.me.com/pondini/Time_Machine/Airport.html] (or use the link in *User Tips* at the top of this forum).
A "full reset" of Time Machine may fix the current problem. See #A4 in [Time Machine - Troubleshooting|http://web.me.com/pondini/Time_Machine/Troubleshooting.html] (or use the link in *User Tips* at the top of the +Time Machine+ forum).
Longer-term, though, you really should find a better way to back up. See #2 in [Time Machine - Frequently Asked Questions|http://web.me.com/pondini/Time_Machine/FAQ.html] (or use the link in *User Tips* at the top of the +Time Machine+ forum).

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