Time Machine Monitoring 'Changes' To Files

Discussion in 'macOS' started by duncyboy, Aug 5, 2009.

  1. duncyboy macrumors 6502a

    Feb 5, 2008
    Hello there

    Long story short I may be using my Mac's external USB drive, temporarily, for another purpose and will be moving the files off it to empty the drive. Once I'm done, I'll be putting the files back on the drive EXACTLY the same as before.

    However, because the 'modified' or 'last changed' date on the files will have changed because they've been moved- the next time Time Machine runs it'll want to back-up everything all over again won't it?

    Even though the files are the same, some of the Metadata will be altered and so TM'll back those up from scratch I suspect?

    Thanks for any advice- I'm 90% certain that'll be how it works but haven't been able to find a definitive answer. :)
  2. miles01110 macrumors Core


    Jul 24, 2006
    The Ivory Tower (I'm not coming down)
    If TM is also backing up your external USB drive then yes, it will most likely register the move/replace as a change.
  3. duncyboy thread starter macrumors 6502a

    Feb 5, 2008
    Yeah, I thought that'd be the case- never mind, not the end of the world.

    I'll probably have to start a fresh TM back-up come September with Snow Leopard anyways so not that big a problem.

    Thanks for the reply
  4. ChrisA macrumors G4

    Jan 5, 2006
    Redondo Beach, California
    Why would you do that?

    The best why to use TM is to give it a disk that is 1.5 or 2 times the size of all your data and then forget about TM.
  5. duncyboy thread starter macrumors 6502a

    Feb 5, 2008
    Because I won't be able to use my Leopard back-up with Snow Leopard. Granted the TM 'image' of my external drive will still be perfectly applicable but the iMac 'image' would be largely redundant because of the OS change.

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