Why does Time Machine suddenly make huge backups

Discussion in 'OS X Mountain Lion (10.8)' started by Pagemakers, Nov 12, 2012.

  1. Pagemakers macrumors 68000

    Pagemakers

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    #1
    For no apparent reason Time Machine is doing a 41GB backup. Why?

    I can see no reason for this.
     
  2. Macman45 macrumors demi-god

    Macman45

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    #2
    Usually it's because you have installed new software, or a major update has been applied.

    Ituns apps can be the culprit too, but TM also takes hourly / daily / weekly and monthly backups. The latter can be larger from time to time.
     
  3. ChristianJapan macrumors 601

    ChristianJapan

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    #3
    Have a look if you backup your mobile device backups; don't have a path right now on hand but those can be lots of GB.

    There is a nice little program in MAS called DaisyDisk; that gives a good overview on your Mac storage; with that I "found" my mobile backup sizes
     
  4. Pagemakers thread starter macrumors 68000

    Pagemakers

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    #4
    Ok, but I haven't really done anything in the last week or so and on the machine concerned I don't use iTunes.

    ----------

    ...And again no mobile device backups. It's my MBA.
     
  5. Macman45 macrumors demi-god

    Macman45

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    #5
    It's also possible to exclude items from backups to from system>preferences>Time Machine. I have a whopping X-Plane installation (75GB) which i don't allow TM to backup. I have a backup copy on my R4, so there is no need to take up all that space on my TC.
     
  6. richard.mac macrumors 603

    richard.mac

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    #6
    Download TimeTrackar from http://www.charlessoft.com and you can use it to see the total size of each backup, which files were backed up backups and their size.
     
  7. Pagemakers thread starter macrumors 68000

    Pagemakers

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  8. sim667 macrumors 65816

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    #8
    I suddenly found that mine was unable to backup to the allocated drive the other day.

    I'd forgotten I'd installed another 2tb hard drive and it was trying to back that up too :rolleyes:
     
  9. Kasalic, Nov 12, 2012
    Last edited: Nov 12, 2012

    Kasalic macrumors regular

    Joined:
    Jan 20, 2011
    #9
    You may know this, but certain types of files, databases are prime examples, can quickly fill a Time Machine hard drive up very quickly. This is because you can make a very small change to a record, however the system will insist on backing up the entire file again.

    For this reason it is recommended that you back up these files differently and exclude them from TM.

    I appreciate this might not be the cause of your problem, but figured I'd throw it out there as no one else had yet.
     
  10. Pagemakers thread starter macrumors 68000

    Pagemakers

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    Location:
    Manchester UK
    #10
    Thank you for your input.

    It's not a problem for me, I was just intrigued as to why the occasional massive backup.
     

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