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  1. #1

    Member Since
    Apr 03, 2009
    Time Machine Not Backing Up
    Anyone have an idea why my time machine backup continually runs about 9.2Gb smaller than the source drive? I've found that at least two of my IDVD projects for some reason are not backing up which accounts for roughly 7.56Gb of the missing 9.2. In addition my photos folder is roughly .06Gb smaller than the source folder and my Library folder is .6Gb smaller.

    I'm running a 2006 Mac Pro with a operating drive size of 750Gb and an OWC firewire 800 external 750Gb for the backup drive. The back up drive was previously erased prior to running Time Machine.

    Thanks for the help.

  2. #2

    Lifeisabeach's Avatar
    Member Since
    Sep 30, 2007
    The Republic of Neptune
    Because it doesn't back up "everything" on the source drive. Many folders are excluded by default, others you may have added yourself. The size difference in what you are seeing in your photos and projects may simply be some sort of cache, hidden files like the resource forks, and so on that are relatively extraneous and not a critical part of backup needs. Try restoring one of your iDVD projects (after manually backing up the original) and see for yourself if anything is really missing.

    Please verify and include the exact model/year of your Mac and OS X version number (available from "About This Mac", then "More Info" on the Apple menu).
    Links: Onyx | EasyFind | Apple Hardware Test | How to test your hard drive | The Safe Mac Adware Removal Guide | Uninstall MacKeeper
    Lifeisabeach - Mac-Forums Member of the Month June 2009, Feb 2012, and March 2013.

  3. #3

    Member Since
    Apr 03, 2009
    You were right! Although the backup IDVD file size is significantly smaller, everything seems to be working fine when I open the backed up file. What a relief!

    Thanks for the help.

  4. #4

    Member Since
    Feb 25, 2009
    Late 2013 rMBP, i7, 750m gpu, OSX versions 10.9.3, 10.10
    Were you looking at just the backups for a given hour? I know that time machine will only back up changed files and use hardlinks to non-changed files in the time machine so it's feasible that if it was last changed on day X at noon and that's when it was backed up, then all that would show in later backups would actually be links to the last changed backup instead of an actual new backup.

    This explains it a bit better then I have...

    you can pretty much consider what time machine is doing as an incremental backup from the last full backup.
    My Macs: Late 2013 rMBP w/ 750m, 16Gig ram; 2013 Mac Pro 6 core w/ D700, 16Gig Ram; Mac mini G4, 1.25 GHz, 512m ram (server); Late 2011 11" MBA, 1.8GHz i7, 4Gig Ram, 256Gig SSD, HD3000; Powerbook 12" G4 1.33GHz running Linux; Apple TV (1080p version)

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