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

    Sep 16, 2015
    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

    Sep 16, 2015
  3. chown33 macrumors 604

    Aug 9, 2009
    Sailing beyond the sunset
    Carbon Copy Cloner uses rsync to make its clones, and it probably isn't alone in that.

    Did you search the App Store for the keyword rsync or sync?
  4. CoastalOR macrumors 68020


    Jan 19, 2015
    Oregon, USA
    +1 for Carbon Copy Cloner, my favorite.
    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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