back up

Discussion in 'Mac Basics and Help' started by bs0604, Oct 9, 2014.

  1. bs0604 macrumors member

    Sep 19, 2014
    I have all my files & pictures (close to a terabyte) on an external drive. A few months ago I backed up this external drive to a 2nd external drive which took a few hours. To do so I dragged the icon of the first external drive on to the icon of the 2nd drive. Its been a few months and I would like to refresh this backup. If I drag the icon again on to the 2nd drive's icon will it just back up those files that have been changed, taking only a matter of minutes, or is it going to replace every file, taking hours?
  2. Communicator macrumors newbie

    Mar 12, 2013
    From what you have written, I would expect it to make a second copy of ALL your backup files, so taking the same time or more that the first backup took.
  3. maflynn Moderator


    Staff Member

    May 3, 2009
    I recommend using a backup software, it will determine what's changed and backup the deltas.

    I use Time Machine for day to day stuff, and Carbon Copy Cloner for my other backups that I want the ability to do a full restore. CCC also does deltas as well.
  4. Apple fanboy macrumors Penryn

    Apple fanboy

    Feb 21, 2012
    Behind the Lens, UK
    Same here. Time Machine for daily back ups. CCC on a third drive every week.

    Also if your main drive fails, you can boot from a CCC drive (not TM).

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