2 copies of Macintosh HD - data
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