Happy to report my failing Time Machine Issues were resolved because of this thread. I indeed had App Cleaner and updated it on 2 separate MacBook Pros and the T M Backups for each broke around that time. Thank you Serge for providing the info on this forum and Nektony has a great page which Serge has linked that explains how to work around the issue until the fix is released. Bugs happen and I've enjoyed using App Cleaner on multiple Macs with no issues until now. It's great to see the Developer proactive and responding to issues like this and sounds like a fix is already completed and under review in the App Store.
Some helpful information I learned while troubleshooting this problem:
- As of macOS Sierra I believe, Time Machine (and likely other macOS apps) use Unified Logging, which combines memory and data stores to store log information, it's no longer stored in flat log files. backup - How to view time machine log in MacOS Sierra? - Super User
You can use the log utility to view Time Machine backup information with the following command:
log show --style syslog --predicate 'senderImagePath contains[cd] "TimeMachine"' --info
That is how I found the exact file that was tripping up my T M Backup. The error the log utility showed from running that command was this:
2018-10-13 17:23:57.595563-0500 localhost backupd[21603]: (TimeMachine) [com.apple.TimeMachine:TMLogError] Error: (-48) SrcErr:NO Copying /Volumes/com.apple.TimeMachine.localsnapshots/Backups.backupdb/Chris’s MacBook Pro/2018-10-13-144347/Macintosh HD/Users/Chris/Library/Containers/com.nektony.App-Cleaner/Data/Library/Application Support/App Cleaner & Uninstaller to /Volumes/Untitled/Backups.backupdb/Chris’s MacBook Pro/2018-10-13-144348.inProgress/59C53699-29D8-429F-AFBF-8C6E4B92EC5A/Macintosh HD/Users/Chris/Library/Containers/com.nektony.App-Cleaner/Data/Library/Application Support
2018-10-13 17:23:57.595722-0500 localhost backupd[21603]: (TimeMachine) [com.apple.TimeMachine:TMLogError] Stopping backup.
2018-10-13 17:23:57.595839-0500 localhost backupd[21603]: (TimeMachine) [com.apple.TimeMachine:TMLogError] Error: (-8062) SrcErr:NO Copying /Volumes/com.apple.TimeMachine.localsnapshots/Backups.backupdb/Chris’s MacBook Pro/2018-10-13-144347/Macintosh HD/Users/Chris/Library/Containers/com.nektony.App-Cleaner/Data/Library/Application Support/App Cleaner & Uninstaller/auth.cer to /Volumes/Untitled/Backups.backupdb/Chris’s MacBook Pro/2018-10-13-144348.inProgress/59C53699-29D8-429F-AFBF-8C6E4B92EC5A/Macintosh HD/Users/Chris/Library/Containers/com.nektony.App-Cleaner/Data/Library/Application Support
2018-10-13 17:23:58.509247-0500 localhost backupd[21603]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Copied 2231121 items (116.33 GB) from volume Macintosh HD. Linked 0.
2018-10-13 17:23:58.527043-0500 localhost backupd[21603]: (TimeMachine) [com.apple.TimeMachine:TMLogError] Copy stage failed with error:11
2018-10-13 17:23:58.821564-0500 localhost backupd[21603]: (TimeMachine) [com.apple.TimeMachine:TMLogInfo] Unmounted local snapshot: com.apple.TimeMachine.2018-10-13-144347 at path: /Volumes/com.apple.TimeMachine.localsnapshots/Backups.backupdb/Chris’s MacBook Pro/2018-10-13-144347/Macintosh HD source: Macintosh HD
2018-10-13 17:23:58.828114-0500 localhost backupd[21603]: (TimeMachine) [com.apple.TimeMachine:TMLogError] Backup failed with error 11: 11
- As previously mentioned, Nektony provided a great workaround page here: https://nektony.com/mac-app-cleaner/troubleshooting. One thing to note is that the 2nd option of deleting BOTH the "App Cleaner & Uninstaller" folders inside "~/Library/Containers/com.nekony.App-Cleaner/Data/Library/Application Support" seems to be fine. When the App Cleaner app is relaunched, it creates a new "App Cleaner & Uninstaller" directory there. I would think that is the preferable route, since it requires no special exclusion from the Time Machine Backup. I tried both methods they listed on different machines and each resulted in successful T M Backups thereafter.
Hope this info helps the next person not have to spend so many hours trying to figure out the issue. Thanks to Marissa from Apple Tech Support who found this thread for me and helped me get to the bottom so I could once again backup my machines with App Cleaner 6.0.