Time Machine vs Mac HD

Discussion in 'iMac' started by dave92029, Nov 30, 2009.

  1. dave92029 macrumors member

    Joined:
    Dec 8, 2008
    #1
    I just set up Time machine. It appears that the external HD with Time machine has 38.2 GB of usage and my iMac HD has 41.07 Gb of usage. :eek:

    Anyone know what the 2.87 Gb difference is between the Time machine usage and the iMac HD? :confused:

    Thanks
     
  2. stridemat Moderator

    stridemat

    Staff Member

    Joined:
    Apr 2, 2008
    Location:
    UK
    #2
    Do you have anything excluded from the TM backup?
     
  3. dave92029 thread starter macrumors member

    Joined:
    Dec 8, 2008
    #3
    Not smart enough yet to exclude anything

    Not that I'm aware of. I don't even know how i would exclude anything. ;)

    I simply plugged in the external HD and then activated TM. :D
     
  4. stridemat Moderator

    stridemat

    Staff Member

    Joined:
    Apr 2, 2008
    Location:
    UK
    #4
    OK lets have a look too make sure.

    Open Time Machine preferences from System Preferences. Now click options. Is anything in this box?
     

    Attached Files:

  5. dave92029 thread starter macrumors member

    Joined:
    Dec 8, 2008
    #5
    No exclusions

    Only Time Machine backup is shown
     
  6. stridemat Moderator

    stridemat

    Staff Member

    Joined:
    Apr 2, 2008
    Location:
    UK
    #6
    hmmmm Im out of ideas. I have even tried 'googleing' it but I can't find any answers. Hopefully someone else might have some bright ideas.
     
  7. dave92029 thread starter macrumors member

    Joined:
    Dec 8, 2008
    #7
    Thank you

    Thanks for trying to assist me.
     
  8. himansk macrumors regular

    Joined:
    Oct 16, 2006
    #8
    Some of that could be attributed to caches and swap files which are not backed up to time machine
     
  9. Warbitrary macrumors regular

    Joined:
    Nov 24, 2009
    Location:
    Montréal, Canada
    #9
    If you are using Transmission (BitTorrent software), I think it automatically excludes downloads in progress (because they change constantly).

    Also, what is the "Estimated size of full backup" in the Options dialog box?
     
  10. dave92029 thread starter macrumors member

    Joined:
    Dec 8, 2008
    #10
    Full size of backup is more confusing - to me

    The Estimated size of Full backup is 44.05GB vs 41.07 on Mac HD vs 38.2 on Time Machine ????:confused:
     
  11. Ochaye macrumors newbie

    Joined:
    Dec 1, 2009
    #11
    Time Machine vs Mac HD

    I don't know, but I'd like to wager a guess:

    41.07 GB = 38.22 GiB,

    where 1 GB = 1000^3 bytes = 10^9 bytes,
    while 1 GiB = 1024^3 bytes = 1073741824 bytes.
    See
    HTML:
    http://en.wikipedia.org/wiki/Gibibyte
    In the transition from Leopard to Snow Leopard, the binary system
    has been replaced by the base-10 numeral system (see
    HTML:
    http://www.macfanatic.net/blog/2009/08/28/snow-leopard-gb-vs-gib/
    ).
     
  12. dave92029 thread starter macrumors member

    Joined:
    Dec 8, 2008
    #12
    Anyone else experiencing similar differences?

    What readings are others showing on iStat?

    Thanks for everyones input.
     
  13. TuffLuffJimmy macrumors G3

    TuffLuffJimmy

    Joined:
    Apr 6, 2007
    Location:
    Portland, OR
    #13
    That would be obnoxiously annoying of Apple to do that.
     
  14. VanNess macrumors 6502a

    VanNess

    Joined:
    Mar 31, 2005
    Location:
    California
    #14
    Time machine backs up almost everything - but not quite.

    By default, Time Machine excludes files that aren't practical to back up, such as cache files, etc., that wouldn't be useful to restore. Whether the default exclusions in your case amount to almost 3 gigs is another matter.
     

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