Time Machine - help (how does it work?)

Discussion in 'macOS' started by shindla, Apr 23, 2014.

  1. shindla macrumors newbie

    Apr 23, 2014
    Hi everyone,

    I'm looking to merge my to Mac's [iMac and MacBook Air] into one. That means I'm selling my MBA and my iMac, and buying the MacBook Pro retina.

    I want more or less my personal mac in a new hardware. So I was thinking about taking a Time Machine backup.

    My first question.
    Time Machine estimates it needs approximately 290 gb of storage space on an external hard drive. Will it be sufficient for me to buy a 320 gb hard drive since the number giving by time machine is only an estimation?
    - I plan on buying a separate drive for my MBA later.

    Second question.
    How does the implementation of time machine backups on a new macbook work. Can it combine two backups (one from iMac; one from MBA) and "merge" them into a new MacBook Pro retina?

    Thanks for your help :apple:
  2. Weaselboy Moderator


    Staff Member

    Jan 23, 2005
    That would work, but it would give you no room for storing versions of files like Time Machine does. For the small price difference, I would get a 500GB to give yourself some room.

    There is not way to merge the two into one TM backup set. You will want to get everything imported to the new Mac then create a new TM backup.

    What you can do it "inherit" one of the old backups to be used as backup for your new machine.

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