How much space does a Time Machine backup require?

Discussion in 'MacBook Pro' started by bailmdb, Jan 4, 2011.

  1. bailmdb macrumors newbie

    Joined:
    Nov 2, 2009
    Location:
    Over there
    #1
    I have a 15" MBP with a 250GB HDD. I have about 150 gigs free, so obviously only 100 gigs are in use. So if I use my external HDD to backup to Time Machine, will I only need 100 gigs of it, or will Time Machine need the full 250GB for the backup? Appreciate the insight.
     
  2. miles01110 macrumors Core

    miles01110

    Joined:
    Jul 24, 2006
    Location:
    The Ivory Tower (I'm not coming down)
    #2
    It will do incremental backups of all the changed files and will take up as much space as you give it after a certain amount of time.
     
  3. newdeal macrumors 68020

    Joined:
    Oct 21, 2009
    #4
    ...

    It will use 100gb to backup and then as you add things it will add to the backup. In all you should probobly use a 500gb drive but it will take years to fill it with just backups.
     
  4. RichyB macrumors regular

    Joined:
    Dec 8, 2010
    #5
    I don't suppose there is a way to be more specific in what you want time machine to back up i.e. documents and safari settings.
     
  5. johnnyturbouk macrumors 68000

    johnnyturbouk

    Joined:
    Feb 9, 2011
    Location:
    on the yellow [oled] brick road to tech nirvana.
    #6
    i have around 50gb on my ssd and 110gb on my optibay hdd
    my time machine is appox 165gb

    i would also ensure that the external hdd u use is formatted to hfs+
    and if you have media on there, to partition the hdd, with one, the remaining for media/personal files amd this partition is in fat32 so i can connect it via usb2 to my router
     
  6. Macsavvytech macrumors 6502a

    Macsavvytech

    Joined:
    May 25, 2010
    #7
    Initial backup is the amount of space used on your main drive, after that incremental backups, backup whatever has changed. I have found with ~30 GB of data on my main drive I can use ~85GB of my Time Machine partition of my external hard drive. I do have a habit of copying big files on and off my main drive very frequently and this is represented in my backups where I have some that have only backed up 10MB and some that have backed up 10GB.
     

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