My time machine is continually backing up, but I have not had a back up recorded since June 30th. How do I fix this?

Ah, ok.

There is another possibility:

If one of your Macs is a desktop model (or is mostly stationary), you could back that Mac up to a directly-connected USB or FireWire drive; and back up the others (via Ethernet or wirelessly) to the same drive, or another connected to it, over your network. See Time Machine - Frequently Asked Question #22 for setup instructions.

3rd-party NASs are fine for most purposes, and while some seem to work reasonably well with Time Machine, there are lots of threads about problems doing that in these forums, especially when a new version of OSX is released. Some of that is just that there's another, very different, operating system involved (on the NAS); more complexity is rarely a good thing for reliable backups.

OK. I don't believe its the NAS drive, as I have another machine on the same LAN, with the same OS, its a Macbook Pro instead of a Macbook, but it seems to be backing up properly. Doing incrementals only instead of full backups.

Feb 23 08:31:52 ninas-macbook com.apple.backupd[3258]: Starting standard backup

Feb 23 08:31:55 ninas-macbook com.apple.backupd[3258]: Attempting to mount network destination URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

Feb 23 08:32:01 ninas-macbook com.apple.backupd[3258]: Mounted network destination at mountpoint: /Volumes/TimeMachine using URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

Feb 23 08:32:22 ninas-macbook com.apple.backupd[3258]: QUICKCHECK ONLY; FILESYSTEM CLEAN

Feb 23 08:32:25 ninas-macbook com.apple.backupd[3258]: Disk image /Volumes/TimeMachine/Nina's MacBook.sparsebundle mounted at: /Volumes/Time Machine Backups

Feb 23 08:32:25 ninas-macbook com.apple.backupd[3258]: Backing up to: /Volumes/Time Machine Backups/Backups.backupdb

Feb 23 08:32:41 ninas-macbook com.apple.backupd[3258]: 389.0 MB required (including padding), 1.12 TB available

Feb 23 08:33:30 ninas-macbook com.apple.backupd[3258]: Copied 4081 files (36.5 MB) from volume Macintosh HD.

Feb 23 08:33:38 ninas-macbook com.apple.backupd[3258]: Copied 4097 files (36.5 MB) from volume Main.

Feb 23 08:33:39 ninas-macbook com.apple.backupd[3258]: 354.7 MB required (including padding), 1.12 TB available

Feb 23 08:33:49 ninas-macbook com.apple.backupd[3258]: Copied 712 files (31 KB) from volume Macintosh HD.

Feb 23 08:33:53 ninas-macbook com.apple.backupd[3258]: Copied 728 files (31 KB) from volume Main.

Feb 23 08:34:01 ninas-macbook mds[76]: (Error) Volume: Could not find requested backup type:2 for volume

Feb 23 08:34:02 ninas-macbook com.apple.backupd[3258]: Starting post-backup thinning

Feb 23 08:34:02 ninas-macbook com.apple.backupd[3258]: No post-back up thinning needed: no expired backups exist

Feb 23 08:34:03 ninas-macbook com.apple.backupd[3258]: Backup completed successfully.

Feb 23 08:34:10 ninas-macbook com.apple.backupd[3258]: Ejected Time Machine disk image.

Feb 23 08:34:11 ninas-macbook com.apple.backupd[3258]: Ejected Time Machine network volume.

Feb 23 12:30:01 ninas-macbook com.apple.backupd[3465]: Starting standard backup

Feb 23 12:30:02 ninas-macbook com.apple.backupd[3465]: Attempting to mount network destination URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

Feb 23 12:30:07 ninas-macbook com.apple.backupd[3465]: Mounted network destination at mountpoint: /Volumes/TimeMachine using URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

Feb 23 12:30:30 ninas-macbook com.apple.backupd[3465]: QUICKCHECK ONLY; FILESYSTEM CLEAN

Feb 23 12:30:33 ninas-macbook com.apple.backupd[3465]: Disk image /Volumes/TimeMachine/Nina's MacBook.sparsebundle mounted at: /Volumes/Time Machine Backups

Feb 23 12:30:33 ninas-macbook com.apple.backupd[3465]: Backing up to: /Volumes/Time Machine Backups/Backups.backupdb

Feb 23 12:30:55 ninas-macbook com.apple.backupd[3465]: 369.7 MB required (including padding), 1.12 TB available

Feb 23 12:31:22 ninas-macbook com.apple.backupd[3465]: Copied 4173 files (12.6 MB) from volume Macintosh HD.

Feb 23 12:31:27 ninas-macbook com.apple.backupd[3465]: Copied 4189 files (12.6 MB) from volume Main.

Feb 23 12:31:27 ninas-macbook com.apple.backupd[3465]: 354.7 MB required (including padding), 1.12 TB available

Feb 23 12:31:36 ninas-macbook com.apple.backupd[3465]: Copied 628 files (129 bytes) from volume Macintosh HD.

Feb 23 12:31:43 ninas-macbook com.apple.backupd[3465]: Copied 644 files (129 bytes) from volume Main.

Feb 23 12:31:44 ninas-macbook mds[76]: (Error) Volume: Could not find requested backup type:2 for volume

Feb 23 12:31:44 ninas-macbook com.apple.backupd[3465]: Starting post-backup thinning

Feb 23 12:31:52 ninas-macbook com.apple.backupd[3465]: Deleted /Volumes/Time Machine Backups/Backups.backupdb/Nina's MacBook/2013-02-22-111447 (13.9 MB)

Feb 23 12:31:56 ninas-macbook com.apple.backupd[3465]: Deleted /Volumes/Time Machine Backups/Backups.backupdb/Nina's MacBook/2013-02-22-101510 (476.0 KB)

Feb 23 12:32:07 ninas-macbook com.apple.backupd[3465]: Deleted /Volumes/Time Machine Backups/Backups.backupdb/Nina's MacBook/2013-02-22-091513 (1.5 MB)

Feb 23 12:32:07 ninas-macbook com.apple.backupd[3465]: Post-back up thinning complete: 3 expired backups removed

Feb 23 12:32:07 ninas-macbook com.apple.backupd[3465]: Backup completed successfully.

Feb 23 12:32:13 ninas-macbook com.apple.backupd[3465]: Ejected Time Machine disk image.

Feb 23 12:32:14 ninas-macbook com.apple.backupd[3465]: Ejected Time Machine network volume.

Feb 23 12:49:14 ninas-macbook com.apple.mtmd[75]: open on /Volumes/Main/.MobileBackups/Computer/2013-02-23-123004/Volume/.autodiskmounted : No such file or directory

Feb 23 12:49:14 ninas-macbook mds[76]: (Error) Backup: doBackupIndexFile could not stat backup location /Volumes/Main/.MobileBackups/Computer/2013-02-23-123004/Volume/.autodiskmounted /Volumes/Main/.MobileBackups/Computer/2013-02-23-123004/Volume/.autodiskmounted . Error 2 with uid 0

Feb 23 12:49:58 ninas-macbook com.apple.backupd[3656]: Starting standard backup

Feb 23 12:49:58 ninas-macbook com.apple.backupd[3656]: Attempting to mount network destination URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

Feb 23 12:50:03 ninas-macbook com.apple.backupd[3656]: Mounted network destination at mountpoint: /Volumes/TimeMachine using URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

Feb 23 12:50:24 ninas-macbook com.apple.backupd[3656]: QUICKCHECK ONLY; FILESYSTEM CLEAN

Feb 23 12:50:26 ninas-macbook com.apple.backupd[3656]: Disk image /Volumes/TimeMachine/Nina's MacBook.sparsebundle mounted at: /Volumes/Time Machine Backups

Feb 23 12:50:26 ninas-macbook com.apple.backupd[3656]: Backing up to: /Volumes/Time Machine Backups/Backups.backupdb

Feb 23 12:50:42 ninas-macbook com.apple.backupd[3656]: 355.4 MB required (including padding), 1.12 TB available

Feb 23 12:50:59 ninas-macbook com.apple.backupd[3656]: Copied 1204 files (618 KB) from volume Macintosh HD.

Feb 23 12:50:59 ninas-macbook com.apple.backupd[3656]: 354.7 MB required (including padding), 1.12 TB available

Feb 23 12:51:07 ninas-macbook com.apple.backupd[3656]: Copied 124 files (93 bytes) from volume Macintosh HD.

Feb 23 12:51:08 ninas-macbook mds[76]: (Error) Volume: Could not find requested backup type:2 for volume

Feb 23 12:51:08 ninas-macbook com.apple.backupd[3656]: Starting post-backup thinning

Feb 23 12:51:08 ninas-macbook com.apple.backupd[3656]: No post-back up thinning needed: no expired backups exist

Feb 23 12:51:08 ninas-macbook com.apple.backupd[3656]: Backup completed successfully.

Feb 23 12:51:14 ninas-macbook com.apple.backupd[3656]: Ejected Time Machine disk image.

Feb 23 12:51:14 ninas-macbook com.apple.backupd[3656]: Ejected Time Machine network volume.

Yes, those are entirely normal -- no connection problems, no mounting problems, etc.

The other Mac's problems still look like network/NAS problems. I'd re-check the setup, connections, etc.

But if you want to reinstall OSX (that won't disturb anything else), that's worth a try. See Installing the ''combo'' update and/or Reinstalling OSX.

I reinstalled the OSX, that turned out to be a challenge, ended up going to the Apple Store, drive reformatted and new OSX installed. But it looks like it was worth it as now Time Machine seems to be functioning properly. I also updated the firmware on the drive, it turned out to be simpler than I expected as it has a built in webserver to manage the drive. Here is my log for the last set of backups. Thanks for your help and your website.

2/25/13 6:27:20.018 AM com.apple.backupd: Copied 101.2 GB of 121.3 GB, 706953 of 773688 items

2/25/13 6:37:10.515 AM com.apple.backupd: Copied 737930 files (107.0 GB) from volume Macintosh HD.

2/25/13 6:37:21.775 AM com.apple.backupd: 853.7 MB required (including padding), 1.52 TB available

2/25/13 6:38:04.290 AM com.apple.backupd: Copied 8005 files (12.6 MB) from volume Macintosh HD.

2/25/13 6:38:15.497 AM com.apple.backupd: Starting post-backup thinning

2/25/13 6:38:15.497 AM com.apple.backupd: No post-back up thinning needed: no expired backups exist

2/25/13 6:38:16.479 AM com.apple.backupd: Backup completed successfully.

2/25/13 6:38:24.737 AM com.apple.backupd: Ejected Time Machine disk image.

2/25/13 6:38:25.050 AM com.apple.backupd: Ejected Time Machine network volume.

2/25/13 7:26:35.405 AM com.apple.backupd: Starting standard backup

2/25/13 7:26:35.613 AM com.apple.backupd: Attempting to mount network destination URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

2/25/13 7:26:35.953 AM com.apple.backupd: Mounted network destination at mountpoint: /Volumes/TimeMachine using URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

2/25/13 7:26:55.038 AM com.apple.backupd: QUICKCHECK ONLY; FILESYSTEM CLEAN

2/25/13 7:26:57.484 AM com.apple.backupd: Disk image /Volumes/TimeMachine/MunMacBook.sparsebundle mounted at: /Volumes/Time Machine Backups

2/25/13 7:26:57.497 AM com.apple.backupd: Backing up to: /Volumes/Time Machine Backups/Backups.backupdb

2/25/13 7:27:23.943 AM com.apple.backupd: 850.9 MB required (including padding), 1.52 TB available

2/25/13 7:27:23.944 AM com.apple.backupd: Waiting for index to be ready (100)

2/25/13 7:28:24.404 AM com.apple.backupd: Waiting for index to be ready (100)

2/25/13 7:29:29.422 AM com.apple.backupd: Copied 5055 files (13.1 MB) from volume Macintosh HD.

2/25/13 7:29:29.790 AM com.apple.backupd: 485.1 MB required (including padding), 1.52 TB available

2/25/13 7:29:43.281 AM com.apple.backupd: Copied 1178 files (148 KB) from volume Macintosh HD.

2/25/13 7:29:45.881 AM com.apple.backupd: Starting post-backup thinning

2/25/13 7:29:45.881 AM com.apple.backupd: No post-back up thinning needed: no expired backups exist

2/25/13 7:29:45.967 AM com.apple.backupd: Backup completed successfully.

2/25/13 7:29:53.605 AM com.apple.backupd: Ejected Time Machine disk image.

2/25/13 7:29:54.050 AM com.apple.backupd: Ejected Time Machine network volume.

2/25/13 8:26:54.959 PM com.apple.backupd: Starting standard backup

2/25/13 8:26:55.916 PM com.apple.backupd: Attempting to mount network destination URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

2/25/13 8:26:56.174 PM com.apple.backupd: Mounted network destination at mountpoint: /Volumes/TimeMachine using URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

2/25/13 8:27:16.485 PM com.apple.backupd: QUICKCHECK ONLY; FILESYSTEM CLEAN

2/25/13 8:27:19.104 PM com.apple.backupd: Disk image /Volumes/TimeMachine/MunMacBook.sparsebundle mounted at: /Volumes/Time Machine Backups

2/25/13 8:27:19.176 PM com.apple.backupd: Backing up to: /Volumes/Time Machine Backups/Backups.backupdb

2/25/13 8:27:45.018 PM com.apple.backupd: 541.5 MB required (including padding), 1.52 TB available

2/25/13 8:29:00.713 PM com.apple.backupd: Copied 15996 files (48.3 MB) from volume Macintosh HD.

2/25/13 8:29:02.493 PM com.apple.backupd: 490.1 MB required (including padding), 1.52 TB available

2/25/13 8:29:20.535 PM com.apple.backupd: Copied 4721 files (920 KB) from volume Macintosh HD.

2/25/13 8:29:27.372 PM com.apple.backupd: Starting post-backup thinning

2/25/13 8:29:27.372 PM com.apple.backupd: No post-back up thinning needed: no expired backups exist

2/25/13 8:29:27.396 PM com.apple.backupd: Backup completed successfully.

2/25/13 8:29:34.695 PM com.apple.backupd: Ejected Time Machine disk image.

2/25/13 8:29:34.989 PM com.apple.backupd: Ejected Time Machine network volume.

2/25/13 9:09:10.686 PM com.apple.backupd: Starting standard backup

2/25/13 9:09:10.963 PM com.apple.backupd: Attempting to mount network destination URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

2/25/13 9:09:11.201 PM com.apple.backupd: Mounted network destination at mountpoint: /Volumes/TimeMachine using URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

2/25/13 9:09:30.188 PM com.apple.backupd: QUICKCHECK ONLY; FILESYSTEM CLEAN

2/25/13 9:09:32.628 PM com.apple.backupd: Disk image /Volumes/TimeMachine/MunMacBook.sparsebundle mounted at: /Volumes/Time Machine Backups

2/25/13 9:09:32.649 PM com.apple.backupd: Backing up to: /Volumes/Time Machine Backups/Backups.backupdb

2/25/13 9:09:47.305 PM com.apple.backupd: 505.4 MB required (including padding), 1.52 TB available

2/25/13 9:10:12.555 PM com.apple.backupd: Copied 5198 files (13.6 MB) from volume Macintosh HD.

2/25/13 9:10:12.920 PM com.apple.backupd: 489.2 MB required (including padding), 1.52 TB available

2/25/13 9:10:22.286 PM com.apple.backupd: Copied 1014 files (120 KB) from volume Macintosh HD.

2/25/13 9:10:24.859 PM com.apple.backupd: Starting post-backup thinning

2/25/13 9:10:24.859 PM com.apple.backupd: No post-back up thinning needed: no expired backups exist

2/25/13 9:10:25.021 PM com.apple.backupd: Backup completed successfully.

2/25/13 9:10:31.924 PM com.apple.backupd: Ejected Time Machine disk image.

2/25/13 9:10:32.198 PM com.apple.backupd: Ejected Time Machine network volume.

2/25/13 10:02:52.164 PM com.apple.backupd: Starting standard backup

2/25/13 10:02:52.208 PM com.apple.backupd: Attempting to mount network destination URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

2/25/13 10:02:52.391 PM com.apple.backupd: Mounted network destination at mountpoint: /Volumes/TimeMachine using URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

2/25/13 10:03:11.398 PM com.apple.backupd: QUICKCHECK ONLY; FILESYSTEM CLEAN

2/25/13 10:03:13.779 PM com.apple.backupd: Disk image /Volumes/TimeMachine/MunMacBook.sparsebundle mounted at: /Volumes/Time Machine Backups

2/25/13 10:03:13.794 PM com.apple.backupd: Backing up to: /Volumes/Time Machine Backups/Backups.backupdb

2/25/13 10:03:26.318 PM com.apple.backupd: 505.5 MB required (including padding), 1.52 TB available

2/25/13 10:04:28.607 PM com.apple.backupd: Copied 5457 files (13.6 MB) from volume Macintosh HD.

2/25/13 10:04:29.234 PM com.apple.backupd: 489.5 MB required (including padding), 1.56 TB available

2/25/13 10:05:08.617 PM com.apple.backupd: Copied 1018 files (351 KB) from volume Macintosh HD.

2/25/13 10:05:17.870 PM com.apple.backupd: Starting post-backup thinning

2/25/13 10:05:17.870 PM com.apple.backupd: No post-back up thinning needed: no expired backups exist

2/25/13 10:05:19.649 PM com.apple.backupd: Backup completed successfully.

2/25/13 10:05:41.365 PM com.apple.backupd: Ejected Time Machine disk image.

2/25/13 10:05:41.699 PM com.apple.backupd: Ejected Time Machine network volume.

2/25/13 10:08:40.661 PM com.apple.backupd-auto: Not starting scheduled Time Machine backup - less than 10 minutes since last backup completed.

2/26/13 1:32:53.816 AM com.apple.backupd: Starting standard backup

2/26/13 1:32:54.380 AM com.apple.backupd: Attempting to mount network destination URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

2/26/13 1:32:55.445 AM com.apple.backupd: Mounted network destination at mountpoint: /Volumes/TimeMachine using URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

2/26/13 2:26:52.404 AM com.apple.backupd: QUICKCHECK ONLY; FILESYSTEM CLEAN

2/26/13 2:26:54.810 AM com.apple.backupd: Disk image /Volumes/TimeMachine/MunMacBook.sparsebundle mounted at: /Volumes/Time Machine Backups

2/26/13 2:26:54.821 AM com.apple.backupd: Backing up to: /Volumes/Time Machine Backups/Backups.backupdb

2/26/13 3:21:08.565 AM com.apple.backupd: 23.14 GB required (including padding), 1.65 TB available

2/26/13 3:27:51.372 AM com.apple.backupd: Copied 25 KB of 18.9 GB, 588 of 825 items

2/26/13 3:51:47.002 AM com.apple.backupd: Copied 9787 files (18.9 GB) from volume Macintosh HD.

2/26/13 3:51:50.395 AM com.apple.backupd: 495.9 MB required (including padding), 1.62 TB available

2/26/13 3:52:19.252 AM com.apple.backupd: Copied 2169 files (4.3 MB) from volume Macintosh HD.

2/26/13 3:52:26.102 AM com.apple.backupd: Starting post-backup thinning

2/26/13 3:52:26.102 AM com.apple.backupd: No post-back up thinning needed: no expired backups exist

2/26/13 3:52:26.149 AM com.apple.backupd: Backup completed successfully.

2/26/13 3:52:34.888 AM com.apple.backupd: Ejected Time Machine disk image.

2/26/13 3:52:35.363 AM com.apple.backupd: Ejected Time Machine network volume.

2/26/13 4:04:55.699 AM com.apple.backupd: Starting standard backup

2/26/13 4:04:55.909 AM com.apple.backupd: Attempting to mount network destination URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

2/26/13 4:04:56.305 AM com.apple.backupd: Mounted network destination at mountpoint: /Volumes/TimeMachine using URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

2/26/13 4:05:16.280 AM com.apple.backupd: QUICKCHECK ONLY; FILESYSTEM CLEAN

2/26/13 4:05:18.947 AM com.apple.backupd: Disk image /Volumes/TimeMachine/MunMacBook.sparsebundle mounted at: /Volumes/Time Machine Backups

2/26/13 4:05:18.957 AM com.apple.backupd: Backing up to: /Volumes/Time Machine Backups/Backups.backupdb

2/26/13 4:05:32.288 AM com.apple.backupd: 493.5 MB required (including padding), 1.61 TB available

2/26/13 4:05:57.815 AM com.apple.backupd: Copied 1879 files (1.9 MB) from volume Macintosh HD.

2/26/13 4:05:58.180 AM com.apple.backupd: 492.1 MB required (including padding), 1.61 TB available

2/26/13 4:06:15.527 AM com.apple.backupd: Copied 994 files (758 KB) from volume Macintosh HD.

2/26/13 4:06:17.171 AM com.apple.backupd: Starting post-backup thinning

2/26/13 4:06:17.171 AM com.apple.backupd: No post-back up thinning needed: no expired backups exist

2/26/13 4:06:17.195 AM com.apple.backupd: Backup completed successfully.

2/26/13 4:06:27.303 AM com.apple.backupd: Ejected Time Machine disk image.

2/26/13 4:06:27.616 AM com.apple.backupd: Ejected Time Machine network volume.

2/26/13 6:35:21.150 AM com.apple.backupd: Starting standard backup

2/26/13 6:35:22.012 AM com.apple.backupd: Attempting to mount network destination URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

2/26/13 6:35:22.510 AM com.apple.backupd: Mounted network destination at mountpoint: /Volumes/TimeMachine using URL: afp://;AUTH=No%20User%20Authent@MyBookLive.local/TimeMachine

2/26/13 6:35:43.045 AM com.apple.backupd: QUICKCHECK ONLY; FILESYSTEM CLEAN

2/26/13 6:35:45.510 AM com.apple.backupd: Disk image /Volumes/TimeMachine/MunMacBook.sparsebundle mounted at: /Volumes/Time Machine Backups

2/26/13 6:35:45.524 AM com.apple.backupd: Backing up to: /Volumes/Time Machine Backups/Backups.backupdb

2/26/13 6:36:03.089 AM com.apple.backupd: 509.0 MB required (including padding), 1.58 TB available

2/26/13 6:36:37.744 AM com.apple.backupd: Copied 5086 files (14.9 MB) from volume Macintosh HD.

2/26/13 6:36:38.233 AM com.apple.backupd: 491.2 MB required (including padding), 1.58 TB available

2/26/13 6:36:50.823 AM com.apple.backupd: Copied 964 files (93 bytes) from volume Macintosh HD.

2/26/13 6:36:52.103 AM com.apple.backupd: Starting post-backup thinning

2/26/13 6:36:52.104 AM com.apple.backupd: No post-back up thinning needed: no expired backups exist

2/26/13 6:36:52.134 AM com.apple.backupd: Backup completed successfully.

2/26/13 6:37:00.488 AM com.apple.backupd: Ejected Time Machine disk image.

2/26/13 6:37:00.797 AM com.apple.backupd: Ejected Time Machine network volume.