I have 2 external HD and everything is set up correctly as you'd expect. The one called "Time Machine" is set as the destination, and other drive, called "External HD", is in the exclusion list, and is not a target.
Yet TM continues to make Backups.backupdb folder appear on the other drive. This dir is very hard to delete. If you Trash it and try to empty the trash, it says it's in use, and every other error message you can think of, including that some files are protected by System Integrity Protection. The last time I had to turn off protection via
csrutil and reboot just to finally empty the trash.
Additionally, "External HD" still shows the TM drive icon as well, just like the real TM drive. I know there're online workarounds for how to fix the icon, but my problem obviously goes beyond that.
For background, I'm on Sierra, 10.12.1. Also, as far as how this happened, I used to have a crappy USB hub, and drives would give out. When the TM drive wasn't available, TM would just take it upon itself to use the other external HD that was available at the time. So there're probably some system files that make it seem like a TM drive, although I'm not seeing anything obvious with
Finally, reformatting is not an option for me, as I don't have enough space on the primary drive to move everything over from "External HD" just to wipe it.
To sum up, I think I need to 1) Remove any trace of TM from a drive and 2) fix its icon. Thanks in advance for any help.