Unable to use Time Machine after Snow Leopard upgrade

This may be answered in other threads, if so I'd appreciate a pointer to them. I couldn't find an appropriate one in my searches.
I have a MBA and recently installed Snow plus the 10.6.1 update. I was having various issues and reinstalled Snow, leaving me at 10.6.0.
I had deleted some applications to free up some space, and decided to restore them with Time Machine (TM). The first time I opened TM, it seemed normal and I restored one of the applications.
Then my external drive where TM backs up to began to backup. Later I tried to open up TM and my desktop froze. After several reboots still had the same issue, I did a Safe Boot. Then rebooted as normal.
Now TM asks if I want to start backing up, net new. It doesn't appear to see the old backups anymore.

Ok, right after reading your response I checked the logs, and I got the following things that seemed relevant:
At the very start of the backup the following message appeared several times:
Mounted network destination using URL: afp://Esperanza%[email protected] /Esperanza%20Brizuela-Garcia'
Error loading /Library/Plug-ins/DiskImages/NUMPlugin.bundle/Contents/MacOS/NUMPlugin: dlopen(/Library/Plug-ins/DiskImages/NUMPlugin.bundle/Contents/MacOS/NUMPlugin, 262): no suitable image found. Did find:\n /Library/Plug-ins/DiskImages/NUMPlugin.bundle/Contents/MacOS/NUMPlugin: mach-o, but wrong architecture
Cannot find function pointer VRPreviewCFPlugInFactory for factory 20D1C6B2-6A02-11D7-B5A6-000393D45566 in CFBundle/CFPlugIn 0x100123320 </Library/Plug-ins/DiskImages/NUMPlugin.bundle> (bundle, not loaded)
Then, at the very end of the log the next things appeared:
Event store UUIDs don't match for volume: Macintosh HD
Forcing deep traversal on source: "Macintosh HD" (mount: '/' fsUUID: 3625EDCE-0845-3846-8922-A92C14C65168 eventDBUUID: BE29DED5-F7FF-4170-BABA-3C4564F1B04B), {1, 1, 1, 0}
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
Waiting for index to be ready (101)
I checked the formatting of my TM machine partition and it did in fact did not match the formatting of my hard disk. I erased and reformatted it. I also excluded the partition from spotlight and from virus scanning. I tried to backup again. It went almost half way through when it hung and the entire system froze with it. I had to unplug and plug again, I could not even restart.
Once it restarted I looked at the logs, I kept getting the first part posted above, but not the second group of errors. The only other suspicious thing I found was:
Oct 11 21:53:55 esperanza-brizuela-garcias-imac com.apple.backupd[1216]: CoreEndianFlipData: error -4940 returned for rsrc type open (id 128, length 12, native = no)
I tried to backup again. It started where it left, but it hung within a few minutes. I checked the logs and this is what I found that looked suspicious:
Oct 11 23:16:58 esperanza-brizuela-garcias-imac diskimages-helper[259]: Cannot find function pointer VRPreviewCFPlugInFactory for factory 20D1C6B2-6A02-11D7-B5A6-000393D45566 in CFBundle/CFPlugIn 0x100115d80 </Library/Plug-ins/DiskImages/NUMPlugin.bundle> (bundle, not loaded)
Oct 11 23:16:58 esperanza-brizuela-garcias-imac com.apple.backupd[255]: 2009-10-11 23:16:58.920 diskimages-helper[259:2103] Error loading /Library/Plug-ins/DiskImages/NUMPlugin.bundle/Contents/MacOS/NUMPlugin: dlopen(/Library/Plug-ins/DiskImages/NUMPlugin.bundle/Contents/MacOS/NUMPlugin, 262): no suitable image found. Did find:
Oct 11 23:16:58 esperanza-brizuela-garcias-imac com.apple.backupd[255]: /Library/Plug-ins/DiskImages/NUMPlugin.bundle/Contents/MacOS/NUMPlugin: mach-o, but wrong architecture
Oct 11 23:16:58 esperanza-brizuela-garcias-imac com.apple.backupd[255]: 2009-10-11 23:16:58.921 diskimages-helper[259:2103] Cannot find function pointer VRPreviewCFPlugInFactory for factory 20D1C6B2-6A02-11D7-B5A6-000393D45566 in CFBundle/CFPlugIn 0x100115d80 </Library/Plug-ins/DiskImages/NUMPlugin.bundle> (bundle, not loaded)
Oct 11 23:17:20 esperanza-brizuela-garcias-imac fseventsd[34]: event logs in /Volumes/Backup of Esperanza Brizuela-Garcia’s iMac/.fseventsd out of sync with volume. destroying old logs. (3323 20 6823)
Oct 11 23:17:21 esperanza-brizuela-garcias-imac com.apple.backupd[255]: Disk image /Volumes/Esperanza Brizuela-Garcia'-1/Esperanza Brizuela-Garcia’s iMac_00254bb26ec6.sparsebundle mounted at: /Volumes/Backup of Esperanza Brizuela-Garcia’s iMac
Oct 11 23:17:28 esperanza-brizuela-garcias-imac fseventsd[34]: log dir: /Volumes/Backup of Esperanza Brizuela-Garcia’s iMac/.fseventsd getting new uuid: FC97BFD1-C6A0-4E01-A35F-6E2EE480AB11
So. it seems like we solved something, but I am still unable to backup without freezing my whole computer.
Any ideas will be greatly appreciated

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Unable to use Time Machine after Snow Leopard upgrade

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