I upgraded to Catalina today, and discovered that Time Machine was not working. An error message indicated that there were two copies of the Macintosh HD - data volume, and stating that one of them should be renamed. Checked it out in disk utility and sure enough there were two copies. I tried renaming one of them as instructed but so far TM is stuck in "Preparing backup" and nothing happening. Any help would be much appreciated.
iMac 27″ 5K, macOS 10.15
Figure out which is the correct one, and remove the other.
First make sure there is nothing on the other that you want.
In Disk Utility, select each and click the Info button.
The valid one will be mounted at /System/Volumes/Data.
The other will be mounted at /Volumes.
Open Disk Utility.
Select each of yhe Macintosh HD - Data volumes and see what it says for “Mount Point”
One of them will say
/System/Volumes/Data - probably the first of the two. This you KEEP.
The other will say /Volumes/Macintosh HD - Data.
This is the one to delete. Control-click and choose Delete APFS Volume.
Th
In Disk Utility, select the volume and click the – button.
How do you remove the volume - "erase" or "delete APFS volume"?
Thanks for the help. That's the volume deleted. Will I have to restart the Mac before trying to backup using TM again?
I have no idea. Couldn't hurt, may not help.
Thanks for the help. TM now working again.
2 copies of Macintosh HD - data
