Time Machine Hard recommended Hard drive Size?

Discussion in 'Mac Basics and Help' started by Mikebike125, Dec 21, 2008.

  1. Mikebike125 macrumors 6502

    Mikebike125

    Joined:
    Mar 25, 2007
    #1
    If I have a 500GB drive on my iMac do I need a to have a 500GB external drive or can I use a smaller amount, say 350GB? What will the effects be?
     
  2. BlueRevolution macrumors 603

    BlueRevolution

    Joined:
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    Location:
    Montreal, QC
    #2
    Well, that depends on a number of factors, chiefly how much space you use on the drive and how often you change large files. Since Time Machine does incremental backups, it will only save files that have been updated in subsequent backups.

    Personally, I size my Time Machine partition to provide half again as much space as is used on my main drive. I have a 320 GB drive, but only about 80 GB of data, so my Time Machine partition is roughly 120 GB (I don't have the drive connected so I can't say for certain how much space I'm using).
     
  3. NT1440 macrumors G4

    NT1440

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    Location:
    Hartford, CT
    #3
    Ive actually been interested in this too.

    I'm sure 500GB is enough.

    As far as im aware, it does an initial backup that mirrors your hard drive, then only adds things that have changed to that.

    Correct?
     
  4. NT1440 macrumors G4

    NT1440

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    May 18, 2008
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    #5
    well that was enlightening:p
     
  5. BlueRevolution macrumors 603

    BlueRevolution

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    #6
    Whaat, you were right! I don't really have anything else to add.

    :rolleyes:
     
  6. NT1440 macrumors G4

    NT1440

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    #7
    B-b-but i like to learn how things work :(

    You dont have any other facts or anything?
     
  7. Eidorian macrumors Penryn

    Eidorian

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    Mar 23, 2005
    Location:
    Indianapolis
    #8
    It depends more on used space then anything else. I've used Time Machine with smaller hard drive since what I want to have backed up is still much less then the total disk capacity.
     
  8. dukebound85 macrumors P6

    dukebound85

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    #9
    right no i have a 500 gig internal and a 250 gig external for time machine

    as you can see there may be an issue lol so what you have to do is decide what things to exclude
     
  9. BlueRevolution macrumors 603

    BlueRevolution

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    Jul 26, 2004
    Location:
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    #10
    What were you looking for, exactly? Time Machine is pretty straightforward.
     
  10. Mikebike125 thread starter macrumors 6502

    Mikebike125

    Joined:
    Mar 25, 2007
    #11
    Possibly it compresses the data? Not sure. I am currently using exactly 138GB not including my movies. I don't mind not backing up the movies because they can be re obtained if lost. I wonder if TM is smart in that it doesn't back up the OS because that is obviously on a DVD.....
     
  11. Mikebike125 thread starter macrumors 6502

    Mikebike125

    Joined:
    Mar 25, 2007
    #12
    I can't seem to find any info or advice on the Apple website. Surely they have some recommendation........
     
  12. Yaris macrumors regular

    Joined:
    Jul 26, 2007
    #13
    I believe apple initially recommended an external drive twice as big as your internal.
     
  13. BlueRevolution macrumors 603

    BlueRevolution

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    Jul 26, 2004
    Location:
    Montreal, QC
    #14
    No, it doesn't.

    Then I'd say a 250 GB backup drive would be plenty.

    ... which would mean you'd need even less space.
     
  14. Mikebike125 thread starter macrumors 6502

    Mikebike125

    Joined:
    Mar 25, 2007
    #15
    Here is some data from my Time machine Discoveries.

    I have a 500GB iMac there is 363.01GB available which means that 136.99GB have been used.

    I got a 1TB external HD and partitioned it into two drives each having 465.76GB

    After Time Machines first back up there was 383.11GB left which means that Time Machine only backed up 82.65GB of stuff. I put no limitations on what TM backed up so essentially I asked it to back up everything.

    This leads me to believe that TM probably does not back up the OS which makes sense. Anyone else have any explanation about the missing GB's???
     
  15. BlueRevolution macrumors 603

    BlueRevolution

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    Jul 26, 2004
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    #16
    Unless you've added explicit exclusions, that'd prettymuch cover it, yeah.
     
  16. Mikebike125 thread starter macrumors 6502

    Mikebike125

    Joined:
    Mar 25, 2007
    #17
    No, I didn't add any exclusions. I think this will work well.
     

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