I seen this message for the past two days:
"Time Machine detected that your backups on “SynologyDS216.local” cannot be reliably restored."
"Time Machine must erase your existing backup history and start a new backup to correct this."
I can access the backup history just fine. The NAS (which have RAID 1) is fine as well.
When I look at the backups:
~ ᐅ tmutil listbackups | tail -n 5
2020-10-15-144522
2020-10-15-151447
2020-10-15-154125
2020-10-15-184439
2020-10-15-195406
We can see that it stopped doing backups exactly 2 days ago, so I decided to do a check:
tmutil verifychecksums /Volumes/Time\ Machine\ Backups/Backups.backupdb/Thomas-MBP
and an error that popped up is:
/Volumes/Time Machine Backups/Backups.backupdb/Thomas-MBP/2020-07-08-200220/Macintosh HD/System/Library/DirectoryServices/DefaultLocalDB/Default: error 257 enumerating path
The directory exists:
total 0
drwxr-xr-x@ 3 root wheel 102B Aug 25 2019 .
drwxr-xr-x@ 5 root wheel 170B Sep 29 2019 ..
drwx------+ 7 root wheel 238B Aug 25 2019 Default
but the permissions are an issue. This file has extended attributes, so I look to see what's up:
/Volumes/Time Machine Backups/Backups.backupdb/Thomas-MBP/2020-07-08-200220/Macintosh HD/System/Library/DirectoryServices/DefaultLocalDB ᐅ sudo ls -le Default
total 0
drwx------@ 2 root wheel 340 Aug 25 2019 aliases
0: group:everyone deny add_file,delete,add_subdirectory,delete_child,writeattr,writeextattr,chown
drwx------@ 2 root wheel 102 Aug 25 2019 computers
0: group:everyone deny add_file,delete,add_subdirectory,delete_child,writeattr,writeextattr,chown
drwx------@ 2 root wheel 4420 Aug 25 2019 groups
0: group:everyone deny add_file,delete,add_subdirectory,delete_child,writeattr,writeextattr,chown
drwx------@ 2 root wheel 102 Aug 25 2019 networks
0: group:everyone deny add_file,delete,add_subdirectory,delete_child,writeattr,writeextattr,chown
drwx------@ 2 root wheel 3468 Aug 25 2019 users
0: group:everyone deny add_file,delete,add_subdirectory,delete_child,writeattr,writeextattr,chown
When looking on the host machine:
/System/Library/DirectoryServices/DefaultLocalDB ᐅ ls -l
total 0
drwxr-xr-x 3 root wheel 96B Jan 1 2020 .
drwxr-xr-x 5 root wheel 160B Jan 1 2020 ..
drwx------ 7 root wheel 224B Jan 1 2020 Default
the permissions are not the same and the data can be accessed.
It looks like TimeMachine claims it can't use the backup due to some permission issues...
I tried to ask about it on the Apple forums but my post got removed because I'm running a beta version of the OS...
Has anyone seen this problem before?