Power Nap Doesn't Backup To USB Drive

Discussion in 'OS X Mountain Lion (10.8)' started by VacTacks11, Aug 5, 2012.

  1. macrumors member

    Aug 24, 2009
    I use a USB drive attached to my Airport Extreme as my Time Machine. I use a program called Time Machine Editor to set my backups to 3am daily (I don't really need every hour).

    I'm finding that my backups aren't happening at 3am when I put my rMBP to sleep. The backups fire right up when I wake it from sleep.

    The USB drive is first mounted, then unmounted when the backup is finished. Is this normal behavior?
  2. macrumors 6502a

    Feb 26, 2011
    Las Vegas, NV
    USB devices are unmounted when you put OS X to sleep I believe.
  3. macrumors 6502a

    May 14, 2012
    I was trying to use a USB connected drive as my time machine backup and I have also found that whilst in power nap it doesn't back up either...

    As soon as I start the air up, off it goes.
  4. macrumors 6502a

    Nov 9, 2010
    I thought that the PowerNap backup was designed to be performed on the SSD as a local time machine backup.

    Because of silent operation and speed.

    Apple wanted to keep the wakeup time low, so a periodic local backup to the internal ssd was their idea of a nice marketing feature.
  5. macrumors 6502a

    May 14, 2012
  6. macrumors 6502a

    Jul 3, 2012
    afaik it doesnt use the normal backup schedule for power nap backups. it just checks if a backup is needed after sleeping 1 hour and then starts it.
  7. macrumors 68040


    May 8, 2011
    Los Angeles
  8. macrumors 6502

    Jul 8, 2012
    Power Nap will not power on a USB drive. It will back up over wifi to a time capsule. But it's not going to power on and back up to a USB drive that gets its power from the Mac you are backing up.

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