Time Machine Problems with OS X  Server

I have been using a MacMini with OS X server for about 5 months, backing it up to Time Machine on an external Western Digital MyBook (2 TB) hard drive. I had no problems until recently, when I migrated all of my iTunes media onto the home user profile on the Server. Time machine now completes backing up about 97% of my files, but consistently will not complete backing up the final 2-3% of files, giving the following error message? "The backup was not performed because an error occurred while copying files to the backup disk." The backup file is listed on the external drive as "2010-04-04-10491.inProgress". This indicates to me that there are certain files that Time Machine will not backup now. I have checked the file sharing permissions on both MacMini hard drives and can not see any problems. I have restarted the system many times with a similar result. I have also reformatted the external drive, with a similar result. Does anybody out there have any suggestions? Thanks for any help you can offer.

The logs didn't really help much.
It looks like it's a permissions issues. There are permissions problems with some of the files on the source disk. Here is what I had to do to fix. I'm sure there is an easier way to do it, but this is what worked for me...
1. Deleted all of my sharepoints in Server Preferences
2. As root, changed the permissions to all of the files on my source disk (recursively) to be owned by my main admin user—the one running the backups.
3. Re-created my sharepoints
That worked for me. Hope it helps others.

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