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I tested Power Nap on my MacBook Pro Retina (Aug 2012) and my Time Machine backup hasn't made any progress. Even the hard drive light is out while the machine sleeps.

Energy saver is at the default setting of sleep after 15 minutes and Enable Power Nap is checked.

It just doesn't seem to work. Are my expectations wrong? Shouldn't it just back up while in "sleep" mode?

This is a newly re-installed OS with no special apps installed and no custom software besides MS Office.

Update: My Mac is plugged into a Thunderbolt monitor (power and TB). The drive is chained off the monitor. Backups don't occur if the drive is directly connected (no monitor) nor through the monitor. The laptop is always plugged in.

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Related: Earlier versions of Mountain Lion needed this patch to work on a Retina Macbook Pro support.apple.com/kb/HT5394 –  makerofthings7 Jan 7 '13 at 6:15
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According to the Apple support doc, using Time Machine to back up in Power Nap requires the laptop to be plugged in:

When your portable Mac is connected to a power source, it also downloads software updates, makes backups with Time Machine, performs Spotlight indexing, and can continue Mac App Store downloads. It also updates Help Center.

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I'm plugged into the Thunderbolt monitor port... and have power from there –  makerofthings7 Jan 7 '13 at 13:08
    
@makerofthings7 Did you try waiting awhile or seeing if Power Nap does other things? It says that Time Machine backups happen hourly. –  Kevin Chen Jan 8 '13 at 2:59
    
I let it cook overnight. Nothing. I called Apple tech support they said safe boot and see what happens... –  makerofthings7 Jan 8 '13 at 3:10
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