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Time Machine fails with error code 11, failed to copy files?

My Time Machine setup went to a mess immediately after installing the 10.15.4 Supplemental Update 19E287. I have two Samsung USB 3.0 SSDs, a T3 and a T5. The following pattern is reproducible on both drives: Format drive > Select for use as Time Machine Disk Complete initial backup > Unplug and reconnect > Commence incremental backup > Time Machine fails with error code 11 > failed copying files > Unplug and reconnect > Message from OS: "macOS can't repair the disk", disk is hosed. I have lost all of my backups and cannot create any new ones. Additional things I've tried: 1) A different USB cable. 2)Connecting the corrupted drive to a different Mac produces the same "can't repair" error. 3)Booted into recovery and checked the internal SSD - no problems.

Best Answered by

iBoysoft author Jenny Zeng

Jenny Zeng

Answered on Wednesday, May 31, 2023

Time machine backup fails with error code 11 may result from corrutped hard drive, damaged files, OS bugs, and connectivity issues. The message "macOS can't repair the disk" may suggest your SSDs are corrupted. But it an also be caused by faulty USB cables or adapters.

Here're my recommendations to fix Time Machine backup failed error 11:

  • Try a USB 2.0 cable if you're using a USB 3.0, as some users have reported encountering the same issue with their USB 3.0 cables.
  • If you're using a USB adapter to conenct the drive to your Mac, conenct it directly with your Mac.
  • If your hard drive has an enclosure, try to take it off and put the actual hard disk into a dock to use it.
  • Update macOS to the latest compatible with your Mac to acquire bug fixes.
  • Check the logs in Console and exclude the file that's causing troubles from Time Machine backup.
  1. Open Finder, then launch the Console app from the Applications/Utilities folder.
  2. Select system.log from the left.
  3. Locate the time where the Time Machine backup failed and check the file that's having issues.
  4. Open Time Machine.
  5. Click Options, then tap the Add button to add the file to the exclusion list.

If you want to recover files on the Time Machine backup disk, scan your drive with iBoysoft Data Recovery for Mac. It's a reliable data recovery tool that can restore lost files from corrupted SSDs, USB sticks, SD cards, HDDs, etc. It's also compatible with macOS Ventura ~ Mac OS X 10.11 El Capitan running on Apple Silicon and Intel-based Macs.

You can preview the files you want to get back before recovery for free!

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How to Fix Disk Utility Can't Repair This Disk Error?

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