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If you are using both Time Machine and CrashPlan as part of you backup strategy then you need to be aware of problem. Code42 sometime in the recent past, late 2015 in think, started setting the "immutable" bit on the CrashPlan.app package in you Applications folder. This will cause Time Machine to fail to completely remove any snapshots that contain CrashPlan.app when it is trying to remove expired hourly and daily snapshots.
Some people say it is a bug introduced in El Capitan and some say it is problem introduced by Code42. Neither Apple nor Code42 are saying much although Code42 has purportedly acknowledged the problem and promised a fix in a future release.
You can tell if you have this problem by looking at your syslog using the Console and filter the output by "backupd". If you see a bunch of these lines in the post thinning step then each of these snapshots is stuck until you can un set the "schg" access control on the CrashPlan.app in the listed snapshot.
The instructions for how to make these repairs are here in there topic Time Machine doesn't recognize existence of old... | Apple Support Communities. At the bottom of the first page there is reply by Gilby101 that has the specific Terminal commands you need to run to find and remove the "schg" ACL. Once that is done the next time Time Machine runs it will finish removing the expired snapshot.
-louie
Some people say it is a bug introduced in El Capitan and some say it is problem introduced by Code42. Neither Apple nor Code42 are saying much although Code42 has purportedly acknowledged the problem and promised a fix in a future release.
You can tell if you have this problem by looking at your syslog using the Console and filter the output by "backupd". If you see a bunch of these lines in the post thinning step then each of these snapshots is stuck until you can un set the "schg" access control on the CrashPlan.app in the listed snapshot.
Code:
Mar 6 08:47:21 QuickSilver com.apple.backupd[3226]: Error: Error Domain=NSOSStatusErrorDomain Code=-36 "ioErr: I/O error (bummers)" deleting backup: /Volumes/Time Machine Backups/Backups.backupdb/QuickSilver/2015-11-30-003350
The instructions for how to make these repairs are here in there topic Time Machine doesn't recognize existence of old... | Apple Support Communities. At the bottom of the first page there is reply by Gilby101 that has the specific Terminal commands you need to run to find and remove the "schg" ACL. Once that is done the next time Time Machine runs it will finish removing the expired snapshot.
-louie