7 Replies Latest reply: Dec 24, 2012 6:19 PM by Hamper
Hamper Level 1 Level 1 (0 points)

I am attempting to back up my computer via Time Machine to an external HDD, when I do so it takes a long time to backup 500GB over USB2, about 20hrs and I can't be away from my computer that long. The problem is that if I stop it before it's finished it won't resume, it just say's it's working for a long time and I give up, all night and through to the morning in one case, so what am I doing wrong?

 

It can't be very much as it's a pretty simple UI, not many options to mess up.

 

It will back up but I have to format the HDD each time and begin from scratch, obviously not something want to have to do every time I want to back up.

 

Thanks.


MacBook (13-inch Late 2007), Mac OS X (10.7.3), 4GB 667 MHz DDR2 SDRAM
  • 1. Re: Resuming back does not work.
    Barry Hemphill Level 7 Level 7 (34,500 points)

    Hello:

     

    I am confused...

     

    The first TM backup does take quite a while.  Subsequent ones are quite rapid.

     

    In any event, you will need to allow the system to complete the first full backup without interrupting it.


    Barry

  • 2. Re: Resuming back does not work.
    Hamper Level 1 Level 1 (0 points)

    I can't believe I can't interrupt the first back up, I've never heard of that.

     

    In any event I was not initially using TM without a backup, I went to use it from an existing one made six months prior and got the same problem.

     

    Are you sure the first backup has to be an uninterrupted one?

  • 3. Re: Resuming back does not work.
    Barry Hemphill Level 7 Level 7 (34,500 points)
    Are you sure the first backup has to be an uninterrupted one?

    Yes, IMHO.

     

     

    If you hooked the computer to a TM backup made six month earlier (if I understand you) TM would back up a LOT of stuff.

     

     

    Barry

  • 4. Re: Resuming back does not work.
    Eric Root Level 6 Level 6 (16,195 points)

    If you can't be away from your computer that long, try going to System Preferences/Time Machine and clicking on the Options button. This will allow you to exclude items from the backup. Get a reasonable size backup and back it up. Then go back to the Options button and remove some previously excluded items and do a second backup at your leisure. Repeat until you have everything backed up.

     

    I have done this multiple times in the past. It takes a bit more effort, but limits the required backup time.

  • 5. Re: Resuming back does not work.
    Pondini Level 8 Level 8 (38,720 points)

    Hamper wrote:

     

    I can't believe I can't interrupt the first back up, I've never heard of that.

    You can, but it's not a good idea, especially if it's been running for a while.  The next backup will be very slow, and will require a good deal of extra space temporarily.

     

    If your backups to a USB drive are running at roughly 25 GB/hour (500 GB / 20 hours), something else may be wrong.  That should run, very roughly, at 40-50 GB/hour under normal circumstances.

     

    See #D2 in Time Machine - Troubleshooting for some possible solutions.

  • 6. Re: Resuming back does not work.
    Hamper Level 1 Level 1 (0 points)

    I think I'll do this.

  • 7. Re: Resuming back does not work.
    Hamper Level 1 Level 1 (0 points)

    Thanks for the info.