![]() Please note that decrypting a disk with the Finder menu may take several hours. On my system (MacMini, M1, BigSur), FirstAid has no problem checking *un-encrypted* backup disks. Just run the DiskUtility from the recovery screen. It is possible to use FirstAid on an encrypted TM backup disk if you do it from Recovery Mode (hold CMD+R at boot). I can't find anything about this error on the forums nor support pages. My alternate backup disk is an encrypted journaled HFS Plus volume and it passes First Aid with no errors. I have reformatted the backup drive and run through the whole process again but got the same result. ![]() Restoring the original state found as unmounted.įile system verify or repair failed. Warning: Unable to read apfs keylocker ranges: No such processĮrror: failed to enable crypto I/O mode for container /dev/rdisk3: Resource busy ![]() Running First Aid on “Mac Backup 07” (disk3s2)Ĭhecking the space manager free queue trees. ![]() However, I have had issues with Time Machine backups in the past so, to ease my mind, I ran Disk Utility First Aid on the Volume and it failed with the following: Then let the Time Machine backup process cycle through a few iterations and it all looked good - no obvious problems. Then used Time Machine to set it as an encrypted backup disk. I used an APFS formatted external 5 TB Disk. ![]() I just upgraded to macOS Big Sur and saw that it supported APFS formatted backup disks. ![]()
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