Time Machine - suddenly back up's fail...

Discussion in 'iMac' started by GilesM, Apr 2, 2011.

  1. GilesM macrumors 6502

    Joined:
    Oct 17, 2008
    #1
    Hello,

    I have been using an external hard drive as my time machine for years, then suddenly the back ups started to fail.
    So I went in to Time Machine settings and found that the reported size of the next back up was greater than space that existed on the drive, then I noticed something odd, my Imac has an internal HD of 250GB of which 94GB is used.
    However the next back up had a reported size of 490GB!

    All my external drives (one for iTunes, one for video content) are excluded, and yet the estimated size of the back up is 490GB from a 250GB drive...

    So, I erased the drive, so now it's empty and ready to take a back up, but with such a huge estimated size it will not fit...

    Any ideas why suddenly Time Machine thinks there is 490GB to back up from a 250 GB system drive with only 94GB used?
     
  2. QuarterSwede macrumors G3

    QuarterSwede

    Joined:
    Oct 1, 2005
    Location:
    Colorado Springs, CO
    #2
    Did you try turning off TM then back on the see if it would try to recalculate again?

    I had a similar problem a while ago where TM filled up and refused to delete the old backups. Luckily, for me, a wipe of my external TM partition did it the trick.
     
  3. GilesM thread starter macrumors 6502

    Joined:
    Oct 17, 2008
    #3
    yep, tried that. I have performed a couple of re-boots of the imac (with and without the time machine drive attached) no luck....
     

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