Time machine

Discussion in 'macOS' started by splatterific, Jul 24, 2012.

  1. splatterific macrumors member

    Jul 20, 2012
    My Mac has 1tb internal drive. I would like to get an external drive to use for time machine. Does time machine make a 1:1 copy. So if I have a 1tb drive time machine would need an equal size also.
  2. blueroom macrumors 603


    Feb 15, 2009
    Toronto, Canada
    It make incremental copies and should be larger than the source (your iMac). You can select folders not to back up if you don't need to backup everything.

    Another option is a Synology NAS (they all support Time Machine)
  3. BSoares macrumors regular

    Jun 22, 2012
    Only if your 1TB is full. Initially they will both be full the same way but as Time Machine starts saving multiple versions of files that one will get more and more full. However, it deletes older files automatically so you don't need to worry.

    I'd get one slightly larger than your internal to be on the safe side. I have a 640GB internal and 1TB external (for Time Machine) on my iMac. The internal has 200GB free, the external is full but it has versions for the past 3 years :)
  4. benwiggy macrumors 68020

    Jun 15, 2012
    Time Machine backs up your entire drive (excluding the things you choose to exclude) on the first time you run it.
    After that, it then copies over only those files that have changed.

    If you have a 500MB file, and you change its name, it will be copied again. If you change its name again, you will have 3 copies of that file.

    Most files on your computer do not change. A lot of the System files and Applications, for instance. Your iTunes files are unlikely to be modified.

    Ideally, you want more space than is USED on your hard drive.

    TM will delete old backups if the backup drive is full.

Share This Page