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recently, perhaps since going to Catalina, my Time Machine fails to back up. Details say that the OS was 'unable to complete back-up. An error occured while creating the back-up folder".
Does anybody else have this problem and what is the solution?
iMac Line (2012 and Later)
If you can't back up or restore your Mac using Time Machine suggests running Disk Utility's First Aid:
Repair a storage device in Disk Utility on Mac - Apple Support explains how to use First Aid.
I added the boldface for emphasis because it's frequently overlooked. To "repair" the startup disk (source) requires restarting your Mac in Recovery mode: Restart your computer in macOS Recovery.
If you can't back up or restore your Mac using Time Machine suggests running Disk Utility's First Aid:
Repair a storage device in Disk Utility on Mac - Apple Support explains how to use First Aid.
I added the boldface for emphasis because it's frequently overlooked. To "repair" the startup disk (source) requires restarting your Mac in Recovery mode: Restart your computer in macOS Recovery.
Finally, after re-installing the OS (Catalina), I was able to erase the contents of the problemmatic drive and re-establish the HD as a mirrored drive.
I am now using a different HD for TimeMachine and back-upare being made, so this one is out of circuit until I need it.
Thank you, but I had already done these things. It seems that there is a problem with the drive as it cannot be unmounted. The OS tells me that something is using it but I can't find what.I can't even erase it. I have disconnected it (it was part of a WD double array and had been set up mirrtored; WD utility just gives query marks) and will try to erase the disc in a separate. holder.
Thank you for your suggestion but I have disconnected that drive to see what I can do in a different HD holder when I have the time.
But what do I do if I find that fsck or mds are running? What are they and what do they do?
Open Activity Monitor, sort on Name, is fsck or mds constantly running when that drive won't disconnect?
Good work, take care my friend. :)
Time Machine Backup Fails
