Apple Event: May 7th at 7 am PT
Have had this issue for about a week. Doesn't appear to be my backup drive. Backups are slow (this is a one-year old backup drive), and when the back up fails (about once a day) the only remedy I have is to delete the temporary backup file on the backup drive, turn off "Back up automatically", restart, and then it works. I'm thinking this is an issue within Big Sur. Any help would be greatly appreciated.
iMac 27″, macOS 11.4
It could be a damaged/corrupt file on your boot drive that is causing the problem.
boot into the Recovery volume (boot with the Command + R keys held down), select Disk Utility and run First Aid on your boot drive. If you get any error indications rerun First Aid till there are none. Then reboot normally and try TM again.
If you still have problems try running First Aid on the TM drive. That will take a lot longer due to its complex ecosystem of privileges and hard links. So be patient.
How much data is being backed up?
How big is the TM drive?
How much free space do you have on the boot drive? On the TM drive?
Have you installed or run any "cleaning", "optimizing", "speed-up" or anti-virus apps on your Mac?
It could be a damaged/corrupt file on your boot drive that is causing the problem.
boot into the Recovery volume (boot with the Command + R keys held down), select Disk Utility and run First Aid on your boot drive. If you get any error indications rerun First Aid till there are none. Then reboot normally and try TM again.
If you still have problems try running First Aid on the TM drive. That will take a lot longer due to its complex ecosystem of privileges and hard links. So be patient.
How much data is being backed up?
How big is the TM drive?
How much free space do you have on the boot drive? On the TM drive?
Have you installed or run any "cleaning", "optimizing", "speed-up" or anti-virus apps on your Mac?
CleanMyMac is considered by most of the experienced contributors to these forums to be akin to malware. What was is not necessary what is good now. Uninstall it according to the developer's instructions and make sure there are no residual support files for it left over by downloading and running the shareware app Find Any File to search for any files with the application's or the developer's name in the file name. For CMM files you'd do the following search(es):
1 - Name contains cleanmymac
2 - Name contains macpaw
Any files that are found can be dragged from the search results window to the Desktop or Trash bin in the Dock for deletion.
FAF can search areas that Spotlight can't like invisible folders, system folders and packages.
The more sophisticated systems get (and more protected) the less compatible are "many of what used to work" apps.
I will remove CleanMyMac and report back.
I removed CleanMyMac and didn't have any issues for 36 hours, until this morning. The only resolution so far is to delete the .inprogress file, restart, and try backing up again.
Time Machine keeps failing to complete backup
