Time Machine Backups Taking 20 Minutes

Hi everyone.
Starting yesterday, my time machine backups are taking 20 minutes, when they used to only take 5. I'm backing up to an AirPort Extreme, via a wireless home network. Here's the latest code from the Console.
3/10/12 10:26:11.581 AM com.apple.backupd: Starting standard backup
3/10/12 10:26:11.600 AM com.apple.backupd: Attempting to mount network destination URL: afp://Michael%20Payne@Extreme%20Pleasantville._afpovertcp._tcp.local/Time%20Mac hine%20Backups
3/10/12 10:26:20.103 AM com.apple.backupd: Mounted network destination at mountpoint: /Volumes/Time Machine Backups using URL: afp://Michael%20Payne@Extreme%20Pleasantville._afpovertcp._tcp.local/Time%20Mac hine%20Backups
3/10/12 10:26:25.308 AM com.apple.backupd: QUICKCHECK ONLY; FILESYSTEM CLEAN
3/10/12 10:26:28.358 AM com.apple.backupd: Disk image /Volumes/Time Machine Backups/Michael’s MacBook Pro.sparsebundle mounted at: /Volumes/Time Machine Backups 1
3/10/12 10:26:28.366 AM com.apple.backupd: Backing up to: /Volumes/Time Machine Backups 1/Backups.backupdb
3/10/12 10:29:15.785 AM com.apple.backupd: 328.7 MB required (including padding), 11.01 GB available
3/10/12 10:29:15.786 AM com.apple.backupd: Waiting for index to be ready (100)
3/10/12 10:30:15.939 AM com.apple.backupd: Waiting for index to be ready (100)
3/10/12 10:31:16.045 AM com.apple.backupd: Waiting for index to be ready (100)
3/10/12 10:32:16.319 AM com.apple.backupd: Waiting for index to be ready (100)
3/10/12 10:33:25.124 AM com.apple.backupd: Copied 2103 files (4.0 MB) from volume Macintosh HD.
3/10/12 10:33:25.490 AM com.apple.backupd: 326.2 MB required (including padding), 11.01 GB available
3/10/12 10:33:25.491 AM com.apple.backupd: Waiting for index to be ready (100)
3/10/12 10:34:27.545 AM com.apple.backupd: Waiting for index to be ready (100)
3/10/12 10:35:28.849 AM com.apple.backupd: Waiting for index to be ready (100)
3/10/12 10:36:30.823 AM com.apple.backupd: Waiting for index to be ready (100)
3/10/12 10:37:32.956 AM com.apple.backupd: Waiting for index to be ready (100)
3/10/12 10:38:34.958 AM com.apple.backupd: Waiting for index to be ready (100)
3/10/12 10:39:36.563 AM com.apple.backupd: Waiting for index to be ready (100)
3/10/12 10:40:37.309 AM com.apple.backupd: Waiting for index to be ready (100)
3/10/12 10:41:38.786 AM com.apple.backupd: Waiting for index to be ready (100)
3/10/12 10:42:57.782 AM com.apple.backupd: Copied 740 files (1.3 MB) from volume Macintosh HD.
3/10/12 10:43:02.358 AM com.apple.backupd: Starting post-backup thinning
3/10/12 10:44:05.835 AM com.apple.backupd: Deleted /Volumes/Time Machine Backups 1/Backups.backupdb/Michael’s MacBook Pro/2012-03-08-223328 (1.8 MB)
3/10/12 10:44:05.835 AM com.apple.backupd: Post-back up thinning complete: 1 expired backups removed
3/10/12 10:44:06.002 AM com.apple.backupd: Backup completed successfully.
3/10/12 10:44:21.968 AM com.apple.backupd: Ejected Time Machine disk image.
3/10/12 10:44:22.204 AM com.apple.backupd: Ejected Time Machine network volume.
It looks like it's a problem with the Indexing. I'm in the process of doing a verification now, but is there anything else I can do to get it back to the 5 minutes or so it takes? If you care, here is a code from a more successful backup that didn't take nearly as long.
3/8/12 10:27:07.728 PM com.apple.backupd: Starting standard backup
3/8/12 10:27:08.081 PM com.apple.backupd: Attempting to mount network destination URL: afp://Michael%20Payne@Extreme%20Pleasantville._afpovertcp._tcp.local/Time%20Mac hine%20Backups
3/8/12 10:27:08.643 PM com.apple.backupd: Mounted network destination at mountpoint: /Volumes/Time Machine Backups using URL: afp://Michael%20Payne@Extreme%20Pleasantville._afpovertcp._tcp.local/Time%20Mac hine%20Backups
3/8/12 10:27:15.446 PM com.apple.backupd: QUICKCHECK ONLY; FILESYSTEM CLEAN
3/8/12 10:27:19.348 PM com.apple.backupd: Disk image /Volumes/Time Machine Backups/Michael’s MacBook Pro.sparsebundle mounted at: /Volumes/Time Machine Backups 1
3/8/12 10:27:19.480 PM com.apple.backupd: Backing up to: /Volumes/Time Machine Backups 1/Backups.backupdb
3/8/12 10:29:02.025 PM com.apple.backupd: 435.2 MB required (including padding), 19.03 GB available
3/8/12 10:31:53.585 PM com.apple.backupd: Copied 1312 files (1.4 MB) from volume Macintosh HD.
3/8/12 10:32:06.643 PM com.apple.backupd: 434.6 MB required (including padding), 19.03 GB available
3/8/12 10:33:28.056 PM com.apple.backupd: Copied 983 files (943 KB) from volume Macintosh HD.
3/8/12 10:33:33.364 PM com.apple.backupd: Starting post-backup thinning
3/8/12 10:35:09.074 PM com.apple.backupd: Deleted /Volumes/Time Machine Backups 1/Backups.backupdb/Michael’s MacBook Pro/2012-03-07-213931 (2.9 MB)
3/8/12 10:35:09.074 PM com.apple.backupd: Post-back up thinning complete: 1 expired backups removed
3/8/12 10:35:09.363 PM com.apple.backupd: Backup completed successfully.
3/8/12 10:35:27.460 PM com.apple.backupd: Ejected Time Machine disk image.
3/8/12 10:35:27.698 PM com.apple.backupd: Ejected Time Machine network volume.
It looks like starting on March 9 is when the problem started happening. I'm using a MacBook Pro with Mac OS X Version 10.7.3.

As an update, the Backup Verification passed.
3/10/12 10:56:09.005 AM com.apple.backupd: Backup verification requested by user.
3/10/12 10:56:09.024 AM com.apple.backupd: Attempting to mount network destination URL: afp://Michael%20Payne@Extreme%20Pleasantville._afpovertcp._tcp.local/Time%20Mac hine%20Backups
3/10/12 10:56:09.715 AM com.apple.backupd: Mounted network destination at mountpoint: /Volumes/Time Machine Backups using URL: afp://Michael%20Payne@Extreme%20Pleasantville._afpovertcp._tcp.local/Time%20Mac hine%20Backups
3/10/12 10:56:10.225 AM com.apple.backupd: Running backup verification
3/10/12 10:56:13.381 AM com.apple.backupd: QUICKCHECK ONLY; FILESYSTEM CLEAN
3/10/12 11:07:43.912 AM com.apple.backupd: Backup verification passed!
3/10/12 11:07:44.483 AM com.apple.backupd: Ejected Time Machine network volume.

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AEF

Thanks for your efforts. Here are my answers, comments, and further info:
I believe I have repaired permissions on my drive as part of my troubleshooting. And I'm sure I checked SMART status, which came up with a thumbs up, so to speak. I'm trying again. I don't see any useful messages in any logs on the console. I'm looking at "All Messages" and there is so far nothing useful. Oh, I think you must mean repair as in "Repair Disk," not "Repair Disk Permissions." I believe the "genius" at the Apple store did that or something just as good. The machine checked out fine according to them.
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Running preflight for "Macintosh HD" (mount: '/' fsUUID: BF606E9A-5FD0-3B92-8D76-33DC63E7B2B1 eventDBUUID: 30DD929D-8982-46C2-BAE6-F0BD1E73916A)
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Preflight complete for "Macintosh HD" (mount: '/' fsUUID: BF606E9A-5FD0-3B92-8D76-33DC63E7B2B1 eventDBUUID: 30DD929D-8982-46C2-BAE6-F0BD1E73916A)
Time elapsed: 1 minute, 39.000 seconds
But the vast majority of the time I do NOT get this message. But if there's something wrong with this apdb file, what can I do to fix it?
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I am running my first time machine backup onto a Western Digital MyBook Live. It is taking forever. Is there antivirus software running in the background or any other settings I need to change to speed it up? Also I am on a wireless network.

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Is there antivirus software running in the background
Only you can determine that. If you're using third party AV software, anything is possible.
NAS devices may not be compatible with Time Machine, regardless of what their manufacturers may claim. Even after the Time Machine backup completes, your backup may be unreliable. You may not discover that until you need to rely upon the backup for some reason, and corruption can occur months or years from now.
Time Machine supports the following backup configurations:
A locally mounted volume
Time Capsule
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Time Machine Backup now taking excessive time.

My time machine backup from my 13in MacBook Pro to my 2TB time capsule is now taking an excessive time. I left it on all evening and all night from 6 pm. At 7am it said it has backed up 3 gb of 28 gb.
I ran a verify disk using Disk Utility. It took 6 hours to complete and found no errors.
A time machine backup to a second drive took 6 hours to complete for the first time.
Any clues as to the issue.

Good idea about the file copy. Will get back with further details.
Yes am using Yosemite and yes am connected via Ethernet. Have also turned off wireless on the MacbookPro to ensure traffic is only via Ethernet and shutdown all other programs ie a time machine backup was the only activity. Also ASUS router traffic analyser showed no significant external upload or download activity.
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This is a brand new MacBook Pro. This would be the first time machine backup being done on it. Is that why it is too slow?

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http://eshop.macsales.com/shop/firewire/on-the-go

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