Pondini - Is This Correct (Time Machine Backup Suddenly Very Quick)

Pondini -
On Friday, and for months before, a full backup always took 11 to 15 minutes.
I downloaded some photos from the camera into iTunes on Friday and then burned them to a DVD for safe keeping; then shut down and went to bed.
Next backup and evey backup since is completed within 20 seconds.
Just to test and see if I am backing up I've put some very big files on the desktop and on the hard drive and in my user account and included them in backups today, and they all backed up and still in less than 20 seconds.
Here's the log from Time Machine Buddy from my most recent backup:
Starting standard backup
Backing up to: /Volumes/Time Machine/Backups.backupdb
No pre-backup thinning needed: 520.6 MB requested (including padding), 90.89 GB available
Copied 626 files (15.1 MB) from volume Macintosh HD.
No pre-backup thinning needed: 502.5 MB requested (including padding), 90.88 GB available
Copied 479 files (44 KB) from volume Macintosh HD.
Starting post-backup thinning
No post-back up thinning needed: no expired backups exist
Backup completed successfully.
Here's the log from the last "typical" 15 minute backup (13:24):
Starting standard backup
Backing up to: /Volumes/Time Machine/Backups.backupdb
Event store UUIDs don't match for volume: Macintosh HD
Node requires deep traversal:/ reason:must scan subdirs|new event db|
No pre-backup thinning needed: 9.90 GB requested (including padding), 41.30 GB available
Copied 949 files (7.1 GB) from volume Macintosh HD.
No pre-backup thinning needed: 502.5 MB requested (including padding), 34.19 GB available
Copied 465 files (324 bytes) from volume Macintosh HD.
Starting post-backup thinning
Deleted backup /Volumes/Time Machine/Backups.backupdb/Phil C. Beverly, Jr.’s iMac/2012-05-25-183056: 63.57 GB now available
Deleted backup /Volumes/Time Machine/Backups.backupdb/Phil C. Beverly, Jr.’s iMac/2012-05-25-173116: 70.68 GB now available
Post-back up thinning complete: 2 expired backups removed
Backup completed successfully.
I've put in bold the only thing that I note which seems "unusual".
And the prior one to the above (which took 12:34):
Starting standard backup
Backing up to: /Volumes/Time Machine/Backups.backupdb
No pre-backup thinning needed: 8.99 GB requested (including padding), 71.54 GB available
Copied 11509 files (7.1 GB) from volume Macintosh HD.
No pre-backup thinning needed: 8.99 GB requested (including padding), 64.43 GB available
Copied 11509 files (7.1 GB) from volume Macintosh HD.
Starting post-backup thinning
No post-back up thinning needed: no expired backups exist
Backup completed successfully.
Seems everything is backing up but at lightning speed.
I'm worried I may have a problem that I'm not "seeing". Any cause for concern?

pcbjr wrote:
Here's the log from Time Machine Buddy from my most recent backup:
Starting standard backup
Backing up to: /Volumes/Time Machine/Backups.backupdb
No pre-backup thinning needed: 520.6 MB requested (including padding), 90.89 GB available
Copied 626 files (15.1 MB) from volume Macintosh HD.
No pre-backup thinning needed: 502.5 MB requested (including padding), 90.88 GB available
Copied 479 files (44 KB) from volume Macintosh HD.
Starting post-backup thinning
No post-back up thinning needed: no expired backups exist
Backup completed successfully.
Here's the log from the last "typical" 15 minute backup (13:24):
Starting standard backup
Backing up to: /Volumes/Time Machine/Backups.backupdb
Event store UUIDs don't match for volume: Macintosh HD
Node requires deep traversal:/ reason:must scan subdirs|new event db|
No pre-backup thinning needed: 9.90 GB requested (including padding), 41.30 GB available
Copied 949 files (7.1 GB) from volume Macintosh HD.
No pre-backup thinning needed: 502.5 MB requested (including padding), 34.19 GB available
Copied 465 files (324 bytes) from volume Macintosh HD.
Starting post-backup thinning
Deleted backup /Volumes/Time Machine/Backups.backupdb/Phil C. Beverly, Jr.’s iMac/2012-05-25-183056: 63.57 GB now available
Deleted backup /Volumes/Time Machine/Backups.backupdb/Phil C. Beverly, Jr.’s iMac/2012-05-25-173116: 70.68 GB now available
Post-back up thinning complete: 2 expired backups removed
Backup completed successfully.
I've put in bold the only thing that I note which seems "unusual".
And the prior one to the above (which took 12:34):
Starting standard backup
Backing up to: /Volumes/Time Machine/Backups.backupdb
No pre-backup thinning needed: 8.99 GB requested (including padding), 71.54 GB available
Copied 11509 files (7.1 GB) from volume Macintosh HD.
No pre-backup thinning needed: 8.99 GB requested (including padding), 64.43 GB available
Copied 11509 files (7.1 GB) from volume Macintosh HD.
Starting post-backup thinning
No post-back up thinning needed: no expired backups exist
Backup completed successfully.
The long backups were copying 7+ GBs; the short one only a few MBs.  If that doesn't seem right, #A2 in Time Machine - Troubleshooting has a couple of apps that will show you exactly what was backed-up each time.
The UUID message you highlighted does indicate something unusual, but normal in many circumstances.  Because of that, Time Machine had to do a "deep traversal" which does take considerably longer than usual.  See the blue box in #A6 of Time Machine - Troubleshooting for an explanation.

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