Time Machine Backup not completed
Which disk is this error message suggesting is too full - the Macintosh HD or the External backup hard drive?
"Time Machine could not back up the disk “Macintosh HD” because it is nearly full. Delete some files on this disk and try again."
I attached a new external hard drive, but got the same error message. The Macintosh still has 1.87 GB on it (500 GB drive), so I didn't think it is the one that is too full... but maybe it needs more space than that to run the backup?
MacBook Pro 15″, macOS 13.3