Time machine unnecessarily doing an entire backup

Discussion in 'macOS' started by karohan, Jun 13, 2011.

  1. karohan macrumors 6502

    Jun 25, 2010
    So I had an entire Time Machine backup. My HDD failed, so when I got my new one, I restored from my backup. Now I want to update the backup, but it's backup up the entire drive, which seems superfluous. Is it supposed to do this?
  2. Jagardn macrumors 6502a

    Apr 18, 2011
    I just replaced my wife's HDD and when it came back up, it started doing something similar. It's actually doing a full compare, but you'll see that the amount of data backed up will be minimal. Once it's done checking the disk, it won't take long.
  3. maflynn Moderator


    Staff Member

    May 3, 2009
    Because to TM's backup software it thinks that everything changed. In a sense it has all changed, the drive changed and I think TM recognizes this and so it goes to back everything up.
  4. karohan thread starter macrumors 6502

    Jun 25, 2010
    Hmm, okay I think you were right Jagardn. It looked like it was doing the full backup for about 25gb (out of the couple hundred), but then at some point it just said indexing backup, so I'm assuming it was finding the same files in my old backup. It finished pretty quickly from there.

    Thanks for the replies
  5. Jagardn macrumors 6502a

    Apr 18, 2011
    Yup, the same way it happened for me. :)

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