View Full Version : Won't (or can't) copy files

06-18-2017, 02:05 PM
Error | Exception: Failed to clear ACLs on /Volumes/MacBook Pro Backup. Invalid argument (-1)

This is an incremental backup. I've been using SuperDuper for years without an error, but I'm not able to backup this time.

06-18-2017, 04:04 PM
You neee to power off your Mac and the drive, then power up again.