I have an iMac running High Sierra version 10.13.6. Attached via the USB port is a 4 TB HDD with a 1 TB partition I use for backups. I've been using Time Machine with the TimeMachineEditor app for almost a year now and its been working fine. Using TimeMachineEditor I have a backup scheduled for once a week. A day or so ago the scheduled backup failed and I can't seem to get it to work.

My earlier backups have been running around 140 MB and I have almost 300 MB on my backup drive. When I go to Time Machine Preferences I get a window like the one shown below.


The blue circle is used to indicate the red message circle. When I click on the red circle I get the following message:


I've run Disk Utility/First Aid on my TimeMachine backup drive and it appears to be ok. Below is an image of the First aid result.

enter image description here

When Disk Utility sees this drive it reports the following:

enter image description here

Can anyone explain what happened and why time machine will not finish the backup.

  • 1
    I can't make this an answer because it's too anecdotal - but I had so many issues with HS & TM that updating to Mojave just 'fixed'. – Tetsujin Nov 10 '18 at 18:31
  • My machine is not Mojaveable? Mojave-able?, Mojavable? – jmh Nov 10 '18 at 18:57
  • Ah, OK... then my only 'solution' would be clone your boot drive, reformat to HFS+ & copy the clone back. Forget APFS on HS, it's a nightmare [but again, that's only anecdotal... see my Question history here for the full story] – Tetsujin Nov 10 '18 at 19:08
  • Wow. That sucks and ends my 5 years of Time Machine use. I decided to use Backblaze as my new backup plan. Any comment of this plan would be appreciated. – jmh Nov 16 '18 at 15:30
  • @Tetsujin You mentioned a link that you did not include in your 2nd comment. You referred to your Question history for the full story but I don't know how to get there – jmh Nov 16 '18 at 15:40

You must log in to answer this question.

Browse other questions tagged .