Time Machine Slow and Won't Complete under Mavericks

I've upgraded an iMac to Mavericks on the day of release.  I noticed Time Machine stopped working.  I'm backing up a 500 GB internal drive (about 50% full)  and 2 TB usb 2.0 drive (about 75% full) to a 3 TB USB drive - it all worked well before the upgrade.
The initial time machine backup took forever and never completed - the time machine volume kept expanding past the 3GB limit of the drive and then would fail due to no space left on the disk.
I reformatted the drive - same problem.  Initial backup size was estimated at about 2.15 TB and ended up failing after 3TB of data was written to the drive.
I then deleted the Time Machine .plists and restarted - same problem.
Then I tried backing up to a 4 TB Synology NAS drive - and it's still going 4 days later but now just continues to add data to a never-completing backup. 
I upgraded an mac mini to mavericks and the backup process never changed.
Anyone have any suggestions on how to get Time Machine working properly?

Thank you very much! I'd say that's what would need to be done. I ended up calling Apple tech support (WORLDS better than Dell tech support I must say) and we weren't able to do anything to the drive, so I ran to the store with my mother and picked out a new external hard drive for her. Guess I'll find out today when I get there how it did last night. I partitioned the drive myself and manually backed up her files on one partition and dedicated the other to time machine back ups.
Thank you so much!

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    6/11/14 3:15:34.517 PM secd[422]:  securityd_xpc_dictionary_handler EscrowSecurityAl[580] DeviceInCircle The operation couldn’t be completed. (com.apple.security.sos.error error 2 - Public Key not available - failed to register before call)
    6/11/14 3:15:51.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:15:51.643 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/AP Mobile 6.2.1.ipa to (null)
    6/11/14 3:15:54.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:16:07.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:16:19.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:16:19.908 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Apple Store 120269.ipa to (null)
    6/11/14 3:16:35.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:16:50.710 PM com.apple.backupd-helper[533]: Not starting scheduled Time Machine backup: Backup already running
    6/11/14 3:16:53.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:17:00.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:17:00.552 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Archetype 1.6.2.ipa to (null)
    6/11/14 3:17:10.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:17:23.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:17:35.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:17:49.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:18:01.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:18:14.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:18:28.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:18:40.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:19:03.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:19:06.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:19:18.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:19:41.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:19:43.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:19:56.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:20:11.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:20:23.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:20:36.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:20:48.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:21:01.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:21:13.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:21:26.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:21:38.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:21:51.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:22:03.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:22:16.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:22:28.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:22:41.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:22:53.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:23:06.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:23:19.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:23:31.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:23:57.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:24:09.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:24:22.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:24:38.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:24:50.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:25:03.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:25:15.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:25:35.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:25:47.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:25:47.887 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Bloomberg 3.0.ipa to (null)
    6/11/14 3:26:01.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:26:13.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:26:13.942 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Calculator 3.4.ipa to (null)
    6/11/14 3:26:26.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:26:26.509 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Camera Zoom 3.1.ipa to (null)
    6/11/14 3:26:39.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:26:52.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:26:52.108 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Cards 2.0.1.ipa to (null)
    6/11/14 3:27:14.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:27:17.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:27:29.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:27:29.606 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Casino 2.5.ipa to (null)
    6/11/14 3:27:47.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:28:00.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:28:00.327 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Clear Day 2.6.ipa to (null)
    6/11/14 3:28:14.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:28:26.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:28:39.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:28:56.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:29:09.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:29:21.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:29:34.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:29:47.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:29:59.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:30:12.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:30:24.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:30:37.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:30:49.085 PM xpcproxy[629]: assertion failed: 13D65: xpcproxy + 3438 [D559FC96-E6B1-363A-B850-C7AC9734F210]: 0x2
    6/11/14 3:30:49.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:30:50.194 PM syncdefaultsd[628]: Fixing push token
    6/11/14 3:30:52.507 PM xpcproxy[632]: assertion failed: 13D65: xpcproxy + 3438 [D559FC96-E6B1-363A-B850-C7AC9734F210]: 0x2
    6/11/14 3:31:02.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:31:14.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:31:27.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:31:39.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:31:52.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:32:05.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:32:17.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:32:30.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:32:42.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:32:55.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:33:07.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:33:30.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:33:32.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:33:55.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:33:58.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:34:21.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:34:23.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:34:46.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:34:49.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:35:02.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:35:18.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:35:30.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:35:30.676 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Collection HD 1.7.ipa to (null)
    6/11/14 3:36:14.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:36:17.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:36:29.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:36:29.651 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/eCardExpress 2.1.ipa to (null)
    6/11/14 3:36:52.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:37:14.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:37:17.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:37:30.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:37:52.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:37:55.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:38:07.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:38:30.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:38:32.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:38:45.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:39:08.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:39:10.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:39:23.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:39:46.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:39:48.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:40:01.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:40:23.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:40:26.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:40:38.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:41:01.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:41:04.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:41:16.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:41:39.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:41:41.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:41:54.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:42:17.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:42:19.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:42:32.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:42:54.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:42:57.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:43:09.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:43:32.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:43:34.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:43:47.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:44:10.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:44:12.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:44:25.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:44:48.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:44:50.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:45:03.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:45:25.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:45:28.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:45:40.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:45:55.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:46:07.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:46:20.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:46:32.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:46:45.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:46:58.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:47:10.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:47:23.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:47:35.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:47:48.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:48:00.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:48:13.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:48:26.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:48:38.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:48:51.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:49:03.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:49:16.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:49:21.393 PM WindowServer[128]: MPAccessSurfaceForDisplayDevice: Set up page flip mode on display 0x04280300 device: 0x7f8ef9d04e00  isBackBuffered: 1 numComp: 3 numDisp: 3
    6/11/14 3:49:21.731 PM launchservicesd[52]: Application App:"System Preferences" asn:0x0-44044 pid:509 refs=7 @ 0x7fb5b9443730 tried to be brought forward, but isn't in fPermittedFrontApps ( ( "LSApplication:0x0-0x45045 pid=513 "com.apple.prefs.backup.remoteservice"")), so denying. : LASSession.cp #1481 SetFrontApplication() q=LSSession 100019/0x186b3 queue
    6/11/14 3:49:21.731 PM WindowServer[128]: [cps/setfront] Failed setting the front application to System Preferences, psn 0x0-0x44044, securitySessionID=0x186b3, err=-13066
    6/11/14 3:49:21.733 PM WindowServer[128]: device_generate_desktop_screenshot: authw 0x0(0), shield 0x7f8ef9e94e00(2001)
    6/11/14 3:49:21.795 PM WindowServer[128]: device_generate_lock_screen_screenshot: authw 0x0(0), shield 0x7f8ef9e94e00(2001)
    6/11/14 3:49:29.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:50:48.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:50:48.546 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/GarageBand 1.1.ipa to (null)
    6/11/14 3:51:01.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:51:13.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:51:26.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:51:38.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:51:51.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:52:03.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:52:16.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:52:29.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:52:41.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:52:55.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:53:07.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:53:07.747 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Glympse 2.22.444.ipa to (null)
    6/11/14 3:53:20.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:53:32.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:53:32.869 PM com.apple.backupd[532]: Stopping backup.
    6/11/14 3:53:32.869 PM com.apple.backupd[532]: Error: (-36) SrcErr:YES Copying /Volumes/Media/itunes Media/Mobile Applications/Golf Channel 3.7.2.ipa to (null)
    6/11/14 3:53:33.357 PM com.apple.backupd[532]: Copied 127 items (2.24 GB) from volume Media. Linked 0.
    6/11/14 3:53:33.376 PM com.apple.backupd[532]: Copy stage failed with error:11
    6/11/14 3:53:34.607 PM com.apple.backupd[532]: Backup failed with error 11: 11
    6/11/14 3:55:53.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:56:05.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:56:18.000 PM kernel[0]: disk1s2: I/O error.
    6/11/14 3:56:33.000 PM kernel[0]: disk1s2: I/O error.

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