Time machine repeatedly backing up huge numbers of files

My TM backup started backing up way more files than usual a few days ago and it takes way longer than it used to. I'm not sure what's going on. I transferred my original TM backup from a 500GB drive to a 1TB drive at the beginning of the year by following Apple's instructions and everything seemed okay until I went to restore a huge folder a few weeks back and got an "incorrect permissions" error. That's when I noticed things were starting to go strange.
Here's a system log from Feb. 29th:
Feb 29 23:19:36 Username com.apple.backupd[2791]: Starting standard backup
Feb 29 23:19:36 Username com.apple.backupd[2791]: Backing up to: /Volumes/Time Machine/Backups.backupdb
Feb 29 23:19:57 Username com.apple.backupd[2791]: No pre-backup thinning needed: 100.0 MB requested (including padding), 366.56 GB available
Feb 29 23:20:18 Username com.apple.backupd[2791]: Copied 1194 files (918 KB) from volume Macintosh HD.
Feb 29 23:20:19 Username com.apple.backupd[2791]: No pre-backup thinning needed: 100.0 MB requested (including padding), 366.56 GB available
Feb 29 23:20:24 Username com.apple.backupd[2791]: Copied 955 files (643 bytes) from volume Macintosh HD.
Feb 29 23:20:28 Username com.apple.backupd[2791]: Starting post-backup thinning
Feb 29 23:20:28 Username com.apple.backupd[2791]: No post-back up thinning needed: no expired backups exist
Feb 29 23:20:28 Username com.apple.backupd[2791]: Backup completed successfully.
And here are 3 system logs from March 11th to today:
Mar 11 17:34:44 Username com.apple.backupd[6818]: Starting standard backup
Mar 11 17:34:44 Username com.apple.backupd[6818]: Backing up to: /Volumes/Time Machine/Backups.backupdb
Mar 11 17:35:01 Username com.apple.backupd[6818]: No pre-backup thinning needed: 100.0 MB requested (including padding), 351.19 GB available
Mar 11 17:36:58 Username com.apple.backupd[6818]: Copied 15523 files (29.4 MB) from volume Macintosh HD.
Mar 11 17:37:18 Username com.apple.backupd[6818]: No pre-backup thinning needed: 100.0 MB requested (including padding), 351.15 GB available
Mar 11 17:38:24 Username com.apple.backupd[6818]: Copied 5910 files (13 KB) from volume Macintosh HD.
Mar 11 17:38:42 Username com.apple.backupd[6818]: Starting post-backup thinning
Mar 11 17:38:42 Username com.apple.backupd[6818]: No post-back up thinning needed: no expired backups exist
Mar 11 17:38:42 Username com.apple.backupd[6818]: Backup completed successfully.
Mar 11 20:34:44 Username com.apple.backupd[7071]: Starting standard backup
Mar 11 20:34:44 Username com.apple.backupd[7071]: Backing up to: /Volumes/Time Machine/Backups.backupdb
Mar 11 20:34:53 Username com.apple.backupd[7071]: No pre-backup thinning needed: 100.0 MB requested (including padding), 351.09 GB available
Mar 11 20:36:48 Username com.apple.backupd[7071]: Copied 15686 files (921 KB) from volume Macintosh HD.
Mar 11 20:37:07 Username com.apple.backupd[7071]: No pre-backup thinning needed: 100.0 MB requested (including padding), 351.08 GB available
Mar 11 20:38:26 Username com.apple.backupd[7071]: Copied 6064 files (14 KB) from volume Macintosh HD.
Mar 11 20:38:44 Username com.apple.backupd[7071]: Starting post-backup thinning
Mar 11 20:38:53 Username com.apple.backupd[7071]: Deleted backup /Volumes/Time Machine/Backups.backupdb/Username/2012-03-10-191732: 351.10 GB now available
Mar 11 20:38:53 Username com.apple.backupd[7071]: Post-back up thinning complete: 1 expired backups removed
Mar 11 20:38:53 Username com.apple.backupd[7071]: Backup completed successfully.
Mar 12 13:16:46 Username com.apple.backupd[683]: No pre-backup thinning needed: 155.7 MB requested (including padding), 350.57 GB available
Mar 12 13:19:16 Username com.apple.backupd[683]: Copied 16359 files (94.5 MB) from volume Macintosh HD.
Mar 12 13:19:44 Username com.apple.backupd[683]: No pre-backup thinning needed: 100.0 MB requested (including padding), 350.47 GB available
Mar 12 13:21:20 Username com.apple.backupd[683]: Copied 6672 files (11.8 MB) from volume Macintosh HD.
Mar 12 13:22:07 Username com.apple.backupd[683]: Starting post-backup thinning
Mar 12 13:22:33 Username com.apple.backupd[683]: Deleted backup /Volumes/Time Machine/Backups.backupdb/Username/2012-03-11-123711: 350.50 GB now available
Mar 12 13:22:33 Username com.apple.backupd[683]: Post-back up thinning complete: 1 expired backups removed
Mar 12 13:22:33 Username com.apple.backupd[683]: Backup completed successfully.
Mar 13 14:00:08 Username com.apple.backupd[852]: Starting standard backup
Mar 13 14:00:09 Username com.apple.backupd[852]: Backing up to: /Volumes/Time Machine/Backups.backupdb
Mar 13 14:00:28 Username com.apple.backupd[852]: No pre-backup thinning needed: 100.0 MB requested (including padding), 350.31 GB available
Mar 13 14:02:56 Username com.apple.backupd[852]: Copied 17334 files (32.0 MB) from volume Macintosh HD.
Mar 13 14:03:30 Username com.apple.backupd[852]: No pre-backup thinning needed: 100.0 MB requested (including padding), 350.27 GB available
Mar 13 14:05:12 Username com.apple.backupd[852]: Copied 7392 files (107 KB) from volume Macintosh HD.
Mar 13 14:06:13 Username com.apple.backupd[852]: Starting post-backup thinning
Mar 13 14:07:10 Username com.apple.backupd[852]: Deleted backup /Volumes/Time Machine/Backups.backupdb/Username/2012-03-12-132122: 350.31 GB now available
Mar 13 14:07:10 Username com.apple.backupd[852]: Post-back up thinning complete: 1 expired backups removed
Mar 13 14:07:10 Username com.apple.backupd[852]: Backup completed successfully.
It's repeatedly copying about 15523 to 17334 files everytime it backs up now and I know these files haven't changed any.
Any suggestions?

We've seen a few of these, for no obvious reason (I don't think any others had a permissions error, so it's probably not related).
Start with a "full reset" of TM, per #A4 in Time Machine - Troubleshooting.  
If that doesn't help, try repairing the backups, per #A5 there.
If still no help, your installation of OSX may be damaged.  Try installing the "combo" update, per Installing the ''combo'' update and/or Reinstalling OSX.
If still no help, try installing a fresh version of Snow Leopard (that won't disturb anything else), per the same article.
A few of the folks that were having this problem solved it with a fresh install of OSX and installing the 10.6.7 "combo" instead of the 10.6.8 version.  For some others, however, that didn't help.

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    Thanks very much for the quick response.  You confirm my intial suspicion, but your suggestion relies on my memory to accomplish on a regular basis (not the best of solutions) and further would be an extended disk run every night because it would not just be backing up new additions but the whole large disk, right?

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