I installed Mojave the other day on my iMac. Time Machine worked for a couple days but now keeps failing. The error states, "Time Machine could not create a local snapshot to back up from because there was insufficient free space on the source volume(s)." The source volume has 88 GB free. I ran First Aid on the Macintosh HD and it didn't resolve it. Running First Aid on the Time Machine drive, which took around six hours, did finally resolve the issue.
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[Solved] Time Machine Backups Failing on Mojave
- Thread starter kramden88
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Glad to hear this ... didn't work for me. But my solution worked, but at a price. I erased my hard drive (losing all my previous backups) and formatted the drive as MacOS Extended (Case Sensitive, Journaled). This has worked for me.
Interesting, I might have to do the same because it works most of the time but fails sporadically.
