How do I do this???

Discussion in 'Mac Basics and Help' started by wuzzbert, Sep 16, 2015.

  1. wuzzbert, Sep 16, 2015
    Last edited: Sep 16, 2015

    wuzzbert macrumors newbie

    Joined:
    Sep 16, 2015
    #1
    I have an external hard drive (A) that I write files to all the time.

    Every so often I copy it to a second external hard drive (B) so I have two copies in case anything goes wrong.

    How do I only copy the changes Ive made to (A) usually being additional files I've created without having to pick them out before copying to (B).

    The only option I seem to get is "Replace" or "stop" on my Mac. If I replace, it takes ages as it completely re-writes (A) on to (B) and its over a 1gb.

    Im using OS X El Capitan and the Time Machine facility is no good as my Macbook Air's storage capacity is not large enough for this amount of data unless I'm missing a trick!!!

    Can anyone help please?
     
  2. wuzzbert thread starter macrumors newbie

    Joined:
    Sep 16, 2015
    #3
  3. chown33 macrumors 604

    Joined:
    Aug 9, 2009
    #4
    Carbon Copy Cloner uses rsync to make its clones, and it probably isn't alone in that.
    https://bombich.com

    Did you search the App Store for the keyword rsync or sync?
     
  4. CoastalOR macrumors 68000

    CoastalOR

    Joined:
    Jan 19, 2015
    Location:
    Oregon, USA
    #5
    +1 for Carbon Copy Cloner, my favorite.
    or
    Another option that I have had good luck with is ChronoSync.

    I use both and both will do what you want.
     

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