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Time Machine issue


Topic starter

I have a late 2015 iMac. I was running Catalina off an external Samsung T5. Decided to install Big Sur after a Nuke & Pave on the internal Fusion Drive. Set Time Machine to a TM Drive I already had formatted to APFS. Unfortunately, every time it goes to run on Big Sur I receive this notification:

How do I correct this?

Thx in advance,


1 Answer

Two thoughts:

If there is a red error symbol next to the drive within Time Machine preferences, click on that symbol to see the error message it shows which may have more detail than the on screen notification. 

More in depth detail of what is happening might be found from the log files by using the free app “The Time Machine Mechanic” (T2M2) from Eclectic Light.