Time Machine "Backup disk not available" error message since install Snow L

Since installing Snow Leopard my back-ups have failed, generating the error message "The back-up disk is not available." Last successful back-up was immediately pre-install of Snow Leopard. TM looks like it is backing up but in the end I get the error message. The wireless aspect for internet connect works fine so I don't think connectivity is the issue.
I am not real techie so insult me with basics. Thanks.

I have four macs using time machine on a single 1TB drive connected to Airport Extreme through USB. This morning I got the dreaded error-109 on Mac#1. This occured right after I had added Mac#4 to the bunch. While adding the Mac#4, I mounted my airport disk and then used time machine to select it for backup. I forgot to eject it after it had done the initial backup. That was when the error occured on the Mac#1.
Mac #1 C2D Mini 2009 SL 10.6.2
Mac #2 G5 DP L 10.5.8
Mac #3 MBP 2009 SL 10.6.2
Mac #4 MB C2D2006 SL 10.6.2
First I turned off TM on all of the Macs. I mounted the airport disk again, on Mac#1. I deleted the sparsebundle for Mac#1. I opened TM and selected the airport disk for backup. It is now backing up again on Mac#1. When it is finished, I will turn on TM once again on the other macs and see what happens. There is still a chunk of space left on the airport disk, about 680GB after all of the backups

Similar Messages

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    Hello,
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