I've had a backup drive sitting on the floor plugged in continuously for a year, and everything's been fine. Then, yesterday I brought in another external drive to do a Time Machine backup for the intention of keeping that drive off-site in case my building ever burns or blows up or whatever. So now, I cannot get Time Machine to continue making backups to the first external drive that I keep on the floor, after having made that other backup yesterday to the new drive. When I try to have it resume backing up to the old drive, I get this stupid message that I cannot move this file ".0019e3f8eec6" to Time Machine, or whatever. Screenshot attached. Help appreciated.