Every night time machine backs up 76GB...

Discussion in 'macOS' started by detz, May 26, 2010.

  1. detz macrumors 65816

    Jun 29, 2007
    I've let it completely finish multiple times and in the morning it was backup only a few megs but I'll suspend go to work and when I get back home it starts up again backing up 76GB. What's going on, obviously somethings wrong, what should I do?
  2. huntercr macrumors 65816

    Jun 6, 2006
    Are you accidentally backing up your Safari cache?
    Is it always 76GB?

    Maybe you should search your harddrive with DiskInventoryX and see if there isn't a file that is 76GB that keeps getting modified somehow causing it to be backed up full every night.
  3. maflynn Moderator


    Staff Member

    May 3, 2009
    Do you use Lightroom or Aperture? Download and run OmniDiskSweeper That will give you a sorted (by size) list of files/folders. Clearly there's a file/library/folder that is that size and being marked as changed.

    Usually the LightRoom and/or Aperture libraries are to blame for this but there could be other apps causing this sort of problem
  4. stujmac26 macrumors regular

    Mar 4, 2009
    Most likely iPhoto, Aperture or Lightroom as stated above - you can exclude them from the TM backup, and in Aperture you can do a separate backup which only backs up changed constituents of the library rather than the whole thing.
  5. crazzyeddie macrumors 68030


    Dec 7, 2002
    Florida, USA
    Library files such as iPhoto are actually folders so that Time Machine backs up the individual files inside of them, not the entire directory.

    The culprit is more likely Bittorrent or video files.
  6. steviem macrumors 68020


    May 26, 2006
    New York, Baby!
  7. detz thread starter macrumors 65816

    Jun 29, 2007
    That's the only thing from what people listed I use. I just added that to my exclude list and now it's backup up again and it's still huge. I'm not sure what else it could be, it never did this and I haven't changed much. Is there a way to see what time machine is backing up, what's changed?

    Weird, I found a script online that tells you and it's backing up apps that I haven't used in a while. It appears it's just doing the backup for the first time...why would this be?

    0B-> 2.8MB /25F6ADE7-F7D2-4FE3-9471-DC60A74E7289/Spike/Applications/Chicken of the VNC.app/Contents/
    0B-> 286.1KB /25F6ADE7-F7D2-4FE3-9471-DC60A74E7289/Spike/Applications/Clipper.app/Contents/
    0B-> 430.0KB /25F6ADE7-F7D2-4FE3-9471-DC60A74E7289/Spike/Applications/Colors.app/Contents/
    0B-> 24.6MB /25F6ADE7-F7D2-4FE3-9471-DC60A74E7289/Spike/Applications/DVD Player.app/Contents/
  8. St. Germain macrumors 6502

    May 19, 2006
    Yes, there is an app to see what Time Machine is backing up. It's called TimeTracker and it's free. It works very well. I had a similar issue with Time Machine always backing up around 7GB each hour. It turned out to be an Adobe DRM cache file.
  9. bperrella macrumors regular

    Apr 8, 2010
    Wirelessly posted (BlackBerry9630/ Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/105)

    Do you use .dmg files to store files? I used to get huge backup sizes because I used a 50gb secure dmg to store personal documents and every time that I modified a file in the dmg time machine would back up the entire dmg

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