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  1. #1
    Why does Time Machine say it requires 150GB more than the size of Data...
    MDJCM's Avatar
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    Why does Time Machine say it requires 150GB more than the size of Data...
    Why does Time Machine say it requires 120GB more than the size of Data i'm trying to back up?

    Estimated size 650GB

    Available space 690GB

    Time Machine "requires" 770GB


    I'm a bit lost, thats a big mark-up

  2. #2
    Why does Time Machine say it requires 150GB more than the size of Data...
    chas_m's Avatar
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    Jan 22, 2010
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    Time Machine is not a clone. It does the initial backup of everything and then does incremental backups adding what's changed. Perhaps it "requires" a 20% margin for doing that.

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