Time Machine - external drive format?

Discussion in 'OS X Mountain Lion (10.8)' started by markp99, Aug 12, 2012.

  1. macrumors member

    Jun 14, 2012
    New Hampshire
    Time Machine Question:

    I've completed my first Time Machine backup (onto Time Capsule). No issues. Next I want to INCLUDE an external USB 3.0 drive to the backup set. This drive is used for archival storage for my Windows Virtual Machine's data files (work stuff - not normally saved on the Mac). I have this disk formatted as exFat, so no problems reading from Win or Mac.

    Complication: Apparently Time Machine does not support exFat formatted drives. I can see the external drive from Time Machine Preferences, but I cannot select it.

    What format should I use to simultaneously support: Mac, Win, Time Machine??
  2. macrumors Core


    Jul 24, 2006
    The Ivory Tower (I'm not coming down)
    Time Machine only works on OS X Extended (Journaled)-formatted drives, so if you want one drive to work with all three you'll need at least two partitions, one of which is formatted properly for TM.

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