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

    Joined:
    Feb 10, 2018
    #1
    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

    cruisin

    Joined:
    Apr 1, 2014
    Location:
    Canada
    #2
    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

    Joined:
    Feb 10, 2018
    #3
    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

    Joined:
    Jan 30, 2007
    Location:
    Tunbridge Wells, UK
    #4
    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

    Joined:
    Dec 1, 2012
    #5
    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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