Time Machine Backup cancels for no "apparent" reason

Hello,
I am using Time machine with Snow Leopard and an external WD My Book 1TB HD - I am using the very latest WD firmware/software (made for Snow Leopard) and was making successful automatic backups for several days until recently when the backup started canceling for no apparent reason. I installed the Time Machine buddy widget and found this message:
Starting standard backup
Backing up to: /Volumes/GPL III BACKUP/Backups.backupdb
No pre-backup thinning needed: 1.80 GB requested (including padding), 894.51 GB available
Error: Flushing index to disk returned an error: 0
Copied 7393 files (997.6 MB) from volume GPL III HD.
Backup canceled.
I tried a manual backup and the same message. I waited until the next automatic backups and got the same message - each and every time.
I have searched the Time Machine section and nothing specifically addresses the error message.
Any ideas on what is wrong and how to resolve it? I thought about erasing the HD and starting over but that seems draconian.
Thanks!

GPL3 wrote:
I checked the set-up and it looks fine except the Tips note that a GUID partition is preferred for some purposes (whatever that means) on Intel Macs (such as mine) rather than the Apple Partition Map which is what the WD HD has - although it does note that either will work. Could this be the problem?
No, I guess I need to try to reword that somehow. Was trying to keep it short. It only matters, under some circumstances, on a drive with OSX installed on it.
Jan 30 08:57:02 Peter-Lambs-iMac virusbarriers[54]: Child scanner 211 exited with exit code: 1
Jan 30 08:57:02 Peter-Lambs-iMac virusbarriers[54]: Child scanner 270 exited with exit code: 1
Jan 30 08:57:10 Peter-Lambs-iMac mdworker32[263]: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
mdworker is used by the mds process (MetaData server); Spotlight is it's main client, but Time Machine also uses it, as do some anti-virus apps. Hard to tell just what sort of problem that was.
Jan 30 08:57:20 Peter-Lambs-iMac mds[34]: (/Volumes/GPL III BACKUP/.Spotlight-V100/Store-V1/Stores/291AAEE8-0631-48A0-AAC8-679C66732217)(Er ror) IndexSDB in dbflushdatastore:/Volumes/GPL III BACKUP/.Spotlight-V100/Store-V1/Stores/291AAEE8-0631-48A0-AAC8-679C66732217/sto re.db : dbsyncdatastore: !WARNING! prior write-errors invalidate sync.
Jan 30 08:57:20 Peter-Lambs-iMac mds[34]: (/Volumes/GPL III BACKUP/.Spotlight-V100/Store-V1/Stores/291AAEE8-0631-48A0-AAC8-679C66732217)(Er ror) IndexCI in _ContentIndexSyncIndexBulk:preSync error:22 12
Jan 30 08:57:20 Peter-Lambs-iMac mds[34]: (/Volumes/GPL III BACKUP/.Spotlight-V100/Store-V1/Stores/291AAEE8-0631-48A0-AAC8-679C66732217)(Er ror) IndexSDB in dbflushdatastore:/Volumes/GPL III BACKUP/.Spotlight-V100/Store-V1/Stores/291AAEE8-0631-48A0-AAC8-679C66732217/sto re.db : dbsyncdatastore: !WARNING! prior write-errors invalidate sync.
Jan 30 08:57:20 Peter-Lambs-iMac mds[34]: (/Volumes/GPL III BACKUP/.Spotlight-V100/Store-V1/Stores/291AAEE8-0631-48A0-AAC8-679C66732217)(Er ror) IndexCI in _ContentIndexSyncIndexBulk:preSync error:22 0
These are all mds having problems in the Spotlight index on your TM drive.
Could my anti-virus SW be an issue (I am using VirusBarrier X6)?
Quite possibly. Exclude your TM disk from it, or turn it off.
Also exclude your TM disk from Spotlight indexing, at least temporarily, via SYstem Preferences > Spotlight > Privacy.
That will likely fix the backup problem.
You really don't need much, if any, anti-virus on a Mac; and many anti-virus products are actually worse than a virus! For more detail, see this post by Klaus1: http://discussions.apple.com/thread.jspa?messageID=10942146&#10942146 or: http://discussions.apple.com/thread.jspa?threadID=2307964
If you're running Windoze, of course, the Windoze side needs all the usual anti- stuff of a PC.

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