My backup drive (named seagate) kept getting the error- not enough space - although the size of the backup is the same as the HD. I am at 60% capacity on my HD.
The error continued even though I erased my backup to restart the process (as well as deleting unnecessary files from my HD, and limiting what was being backed up)
In setting up Time Machine again, it's asking if I want to replace the back up disk "Macintosh HD" or back up to both disks. I just want to use seagate, but am now concerned somehow it will erase my HD. Is that concern invalid? It would certainly be counterproductive to lose what I'm trying to save