Time Machine secret technique?

Discussion in 'OS X Mountain Lion (10.8)' started by sytrusze, Sep 13, 2012.

  1. sytrusze macrumors member

    Nov 17, 2010
    Dear members,

    I was just wondering how Time Machine works. I have an 1TB Time Machine harddrive. The Time Machine harddrive contains the following maps:

    Backups.backupdb -> Sytrus iMac -> (In here i have about 30 backup maps from january to yesterday's date)

    All those 30 maps are 650gb large. Let's do math: 30 x 650gb = 19.500gb = +- 19TB, that's 19 times the size of my harddrive.

    How is this possible?
  2. ratfink macrumors member

    Feb 11, 2012
    If I had to guess I'd say it's using a form of hard linking. You might have two files in different locations pointing to the same data.
  3. Weaselboy Moderator


    Staff Member

    Jan 23, 2005
    That is exactly what it is. More info here.
  4. sytrusze thread starter macrumors member

    Nov 17, 2010
    Interesting article, thanks for the link and explanation.

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