Anyway of seeing what Time Machine is backing up?

Discussion in 'macOS High Sierra (10.13)' started by chublet, Mar 26, 2018.

  1. chublet macrumors member

    Feb 10, 2018
    My Time machine backs up as normal - hourly, daily, weekly - and I have excluded as many folders as I think I don't need etc. But I just noticed it doing a backup of 458MB and I can't for the life of me work out what would need backing up in the last hour/day.

    Is there any way of seeing what files will be backed up at the next backup so I can see whether I am in fact backing one up that I don't want to?
  2. cruisin macrumors 6502a


    Apr 1, 2014
    It doesn't do partial file backups, so if it is a big file that is modified it will transfer the whole file again or if you have a bunch of files even slightly modified it will transfer everything again.
  3. chublet thread starter macrumors member

    Feb 10, 2018
    Thanks for the reply, that makes sense - I guess if I am streaming something over Plex then as its is transcoding it may be making a temp file somewhere which is then being backed up, possibly the case? Same with safari, if I am browsing web sites during the hour between backups it will copy the updated History file I presume?

    Not a massive issue for me but I do like to know what is going on!
  4. akidd macrumors regular

    Jan 30, 2007
    Tunbridge Wells, UK
    I wouldn't worry it, it's tiny. It's when it says 20gb even though it did it yesterday (with no films, streaming or big PS) it concerns me.
  5. ItWasNotMe macrumors 6502

    Dec 1, 2012
    Start Terminal

    Enter the following: tmutil compare

    which reforms a difference

    For an explanation from terminal type: man tmutil

    and scroll down to the relevant section

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