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time machine not backing up system files

I have discovered that Time Machine is not (and apparently has not been for some time) backing up system files (Applications, Utilities, System and Library). What's going on? They are not excluded in the options. Anyone have this problem and know of a solution?

iMac, OS X Mountain Lion

Posted on Nov 30, 2012 1:50 PM

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Posted on Nov 30, 2012 3:17 PM

If you have more than one user account, you must be logged in as an administrator to carry out these instructions.


Launch the Terminal application in any of the following ways:


☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)


☞ In the Finder, select Go Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.


☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.


Triple-click the line below to select it, then drag or copy into the Terminal window — do not type — and press return:


sudo defaults delete /Library/Preferences/com.apple.TimeMachine.plist SkipSystemFiles


You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning not to screw up. If you don’t have a login password, you’ll need to set one before you can run the command.


Reboot and run a backup. Check that the previously excluded files are now included. The backup may take much longer than usual.

43 replies

Dec 8, 2012 3:57 PM in response to Linc Davis

Something strange is going on. I went into TimeMachine (just prior to my last post) and my System and Application files were "not there". I deleted the plist, rebooted and now there "are there".


So, apparantly the second issue I had (just now noticed) was not the same as the first, inasmuch as the files were being backed up (and have been since 1 December, when I first deleted the plist) but for some reason they were not visible to me until I deleted the plist. Possibly a different (but related) problem, but definately not the exact same issue as previously. Something strange is definately happening here. I've also had issues of TM backups failing "due to lack of space", which should not happen since the oldest backups should simply be deleted when that occurs, and I wonder if the two things could be somehow related to each other.

Jan 3, 2013 8:46 AM in response to Gilby101

Oh god the exact same thing has just happened to me. I got a replacement hard drive, swapped out my old one, only to find that my time machine backup was incomplete 😟


At first I thought I had accidentally excluded System Files, so I swapped back in my old hard drive and checked. Nothing was excluded (supposedly). Anyways I found a CNET article telling me to turn SkipSystemFiles to false through terminal so I did that, re-did a WHOLE NEW backup on a new hard drive and system files are still absent!!

So finally at the end of the day I come here and see your comment. Same issue. All my system files in "ExcludeByPath" just randomly. For what its worth, I too have Silverlight installed.

Have you reported the potential bug in the API?

Jan 8, 2013 1:26 PM in response to ashwin103

ashwin103 wrote:


Have you reported the potential bug in the API?


Not at this point. I'm not sure if it's an issue with the app or some other happening from some other source. And Apple is probably getting tired of me... I seem to have a knack for "breaking" things (in the sense of finding flaws). I've long said I should be a beta tester for someone because of that ability to break anything but it hasn't ever happened1 🙂

Jan 17, 2013 1:32 PM in response to WendyRobin

I am on Mountain Lion moved from Snow Leopard.


Moving the Applications folder out of the finder sidebar also fixed my problem.

I did a re-boot after removing the folder. A window came up asking me if I want to use the current drive I was using for time machine backups. I agreed and a backup started.

All my missing folders are now backing up.

One of those mysterious Lion things going on.

The strange thing is that a MacbookPro Retina has the folders in the Finder sidebar and there is no problem with Time Machine.

Jan 28, 2013 8:11 AM in response to Tony Furniss

Tony Furniss wrote:

I tried the Terminal code, but it could not find:

domain (/Library,Prefersnces/com.apple.TimeMachine.plist) not found


Presumably because I have not excluded anything.


The plist will always be there, as long as Time Machine has been turned on. Instead of doing it via Terminal, try turning off Time Machine, finding the file via Finder (Go>Go to folder> "/Library/Preferences") and deleting the TimeMachine plist, and then turning Time Machine back on. That should create a brand new plist with nothing excluded. At least, this worked for me.

Jan 28, 2013 10:30 AM in response to ashwin103

I guess they are still there.

!"#7_ SkipSystemFiles[BackupAlias]ExcludeByPath]MobileBackupsZAutoBackup_ RequiresACPower_ AlwaysShowDeletedBackupsWarning_ DestinationUUIDsYHostUUIDs^RootVolumeUUID_ LastDestinationID\Destinations_ PreferencesVersion O 6 6 TimeMachineÃ¡Ê H+ TimeMachine Ã¡Ê ˇˇˇˇ TimeMachine Ã¡Ê Ã¡Ê TimeMachine:TimeMachine TimeMachine TimeMachine /Volumes/TimeMachineˇˇß ]/ApplicationsX/LibraryW/SystemT/binX/privateU/sbinT/usr ¢ _ $D2772994-E400-3958-80D7-D85560ABC08E_ $D346E6A9-FA9A-367B-8FD6-B1EC5908DE3A° _ $0742FC7E-0752-540C-9A87-2EA3810C97A3_ $49DB845A-A6FF-3655-920F-1B2EE93D3248_ $0CF789DE-8BAB-4E9B-93D9-5E33D276872B°$Ÿ%&'()*+,-./0123456VRESULTYBytesUsed]Des tinationID[BackupAlias]SnapshotCount_ $kCSBackupdOldestCompleteSnapshotDate_ BACKUP_COMPLETED_DATE^BytesAvailable_ DestinationUUIDs 8E¿_ $0CF789DE-8BAB-4E9B-93D9-5E33D276872BO 6 6 TimeMachineÃ¡Ê H+ TimeMachine Ã¡Ê ˇˇˇˇ TimeMachine Ã¡Ê Ã¡Ê TimeMachine:TimeMachine TimeMachine TimeMachine /Volumes/TimeMachineˇˇ -3A∂Nw#3A∂∂˘£ ≈tK¢ #5AO]hzúØπ»‹È˛ˇ 9 A O X ` e n t y z { | } Ä ß Œ – ˜ E G Z a k y Ö ì ∫ “ · Ù ˆ ˇ & ` b k t } Ä 8 Ç

Jan 28, 2013 10:40 AM in response to Tony Furniss

Tony Furniss wrote:


I guess they are still there.

Ok well then are you sure it got deleted in the first place? Make sure you turn off Time Machine and quit System Preferences and everything, then delete, then Empty Trash, make sure its gone, and then turn on Time Machine again. If <ExcludeByPath> is still there, you might want to try editing the plist in TextEdit or something and removing then manually but that is a bit dangerous.

time machine not backing up system files

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