How to make DMG out of my OS

Discussion in 'OS X Mountain Lion (10.8)' started by TheHellRider, Feb 10, 2013.

  1. TheHellRider macrumors newbie

    Feb 10, 2013
    Anyone out there know how to make a backup of your os?
    I want to backup my operating system into a disk file (IMG,ISO,or DMG), because i lost the original disk that comes with the mac! :(
    please help!
    it's really important!
    Thanks in advance!
  2. benwiggy macrumors 68020

    Jun 15, 2012
    What OS version are you running? The last OS that came on a disk was Snow Leopard. And the installer disk is not the same as a copy of your OS. Your OS won't fit onto a DVD. You can still buy Snow Leopard disks from Apple for not much money.

    If you're on Lion or Mountain Lion, then you can boot up to the Recovery Partition and re-install the OS from there. You can also use the Recovery Partition to install the OS on an external drive. You can make a .dmg disk image using Disk Utility in the Recovery Partition, too.

    Of course, you do have a copy of your OS as part of your Time Machine backup. ;)

    Can I ask why it's important? It's rarely necessary to reinstall the OS unless you're installing on a new drive.
  3. TheHellRider, Feb 15, 2013
    Last edited: Feb 15, 2013

    TheHellRider thread starter macrumors newbie

    Feb 10, 2013
    Well, i don't actually want to install it again!
    What i actually want to do is to make a img/dmg file out of it, so then, later, i will extract boot camp's windows 7 support software.
    And what you said about disk utility. it doesn't actually make an img/dmg file out of the os. What it actually does, is to make an img/dmg file of all your documents and things!
    And for the time machine backup. Yes i do back it up on my time machine. The problem is, i don't know where it is! :(
    Please help as soon as you can.
    Thanks in advance! ;)
    By the way, my os is snow leopard.

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