2 copies of Macintosh HD - Data seen by TimeMachine
3 weeks ago I upgraded to Big Sur. Everything was fine until I tried to back up using Time Machine today, when I received an error message saying it could not back up because there were 2 disks with the same name, and I should rename one of the disks named Macintosh HD - Data.
I opened Disk Utility, renamed one of the Macintosh HD - Data disks, dismounted my backup drive, remounted it and tried again. No improvement. I restarted my Mac. No improvement. I've repeated this several times, each time without any success.
From a number of blog posts I've read this appears to be a problem with Time Machine under Catalina and Big Sur. Is there any solution, or should I just give up because Time Machine is a lost cause?
Thanks for any help you may be able to give.