Mountain Lion Will Not Backup on Previous Time Machine Backup Drive, Help!

I tried verifying and repairing both disks, comes back green. Still fails,

8/14/12 10:59:06.611 AM com.apple.backupd[27500]: Stopping backup.

8/14/12 10:59:06.627 AM com.apple.backupd[27500]: Error: (-34) SrcErr:NO Copying /Library/iTunes/Movies/Jasmine - Year 2.m4v to /Volumes/My Book/Backups.backupdb/koe/2012-08-14-095326.inProgress/576367C8-0B1B-4552-B680- 9A908F9E1EC8/Macintosh HD/Library/iTunes/Movies

8/14/12 10:59:07.412 AM com.apple.backupd[27500]: Copied 545956 files (90.71 GB) from volume Macintosh HD.

8/14/12 10:59:07.412 AM com.apple.backupd[27500]: Copy stage failed with error:28

I tried deleting the file in question, but next backup fails on another file from same directory. Quit iTunes, same result. This only started happenening after upgrade to Mountain Lion, I haven't had a successfull backup since

Thanks in advance

koe_kto wrote:

. . .

I tried deleting the file in question, but next backup fails on another file from same directory.

No, don't delete (at least not yet). Instead, exclude it from backups. If the other files were also in iTunes/Movies, exclude that entire folder. See Time Machine - Frequently Asked Question #10 for instructions.

That should get you a good backup of everything else; then you can try to narrow down where the problem(s) are.

Hi,

just be patient. After a few hours it did eventually work for me.

Regards

Thank you so much! It finally started working again.

Caveat: I excluded "offending" folder, made sure one backup completed, then included it again, and ran another backup. This second backup comes up consideraly larger (this folder is full of movies), so a bunch of older backups got deleted.

Thanks for your help!

I fixed it by unplugging my USB drive from Airport Extreme. Wait for 30 seconds. Then restart the Mac and run Time Machine again. Time Machine asked me to reselect a drive. Did that and wait for 15 seconds. Time Machine found the drive and start backing up again.

Kw

I might have some insight after eading through this topic.

I didn't know that the sparsebundle the Time Machine creates depends on the MAC address.

Considering that the wifi card and ethernet port have different MAC addresses then it is possible that if the sparsebundle was reliant on an ethernet based MAC and then you switch over to backing up with wifi, then there might be some confusion (or failure) on which MAC to utilize. I don't know if this is in any way true, but it could be that this is now part of the puzzle.

Anyone?

Good Night!

No, it uses the same address whether via WIFI or Ethernet.

In fact, effective with Lion, it uses the "Hardware UUID," not either MAC address. In Leopard and Snow Leopard, it used the Ethernet MAC address.

Apple (and others) recommend doing the first backup via Ethernet, since it's so much faster, then switch to WIFI for convenience.

Thanks, Pondini. Vey informative.