Mac power nap not working

By default, it is on. Moreover, if Mac in sleep mode is plugged into a power outlet, it can: The Power Nap is supported by the following Mac models: On th or later computers, the Power Nap function works until the battery is depleted.

If your Mac is not connected to AC power, then the Power Nap function communicates with apps and transmits the data within just a few minutes cycle. When connected to an AC network, communication and data transfer are not interrupted.

What Power Nap Does

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To the user, this feature can appear to be a general system slowdown. Here's everything we expect. My Profile Log Out. Join Discussion. Add Your Comment. Apple Admins wanted for Mac Outlook setup survey. Maybe this has something to do with it? If Power Nap activates and wakes the Mac, it would have to power up the drive as well, otherwise some applications might not be able to access data on the drive and crash or throw an error message. But an external hard drive would make some noise and probably light up an LED when it powers up I'm not saying it makes sense, but maybe Apple just disabled Power Nap in case an external hard drive is connected?

So it seems Apple should at least give their users some detailed information about how exactly that feature works. Jul 30, 1: Today I intentionally left my Thunderbolt drive disconnected while I was away and my MacBook Pro was sleeping, but no Time Machine backup has occured in the last 14 hours. So it seems like Power Nap does not work properly, no matter whether an external drive is connected or not. But anyway, the sense of having Time Machine backup my Mac every hour while it's sleeping when a current backup is already on my Time Capsule escapes me.

Maybe Power Nap is working as designed and is only supposed to complete backups that were underway when the Mac was put to sleep Jul 30, 2: For me that would really be a great feature as I don't have a Time Capsule and don't want to carry around my external drive all day. I thought I would just plug in the power cable and let the Mac do the rest over night. Unfortunately that doesn't seem to work. Jul 31, 7: Jul 31, 2: It's not working for my rMBP whether the lid is open or closed. There's no backups done to my Time Capsule. Plus, Mail isn't being processed.

How Power Nap works

It's the main feature I was hopeful for. My iPhone and iPad don't have any filtering for spam, so if the rMBP doesn't hit my accounts first, I end up with a bunch of junk to sort through on my iOS devices. I enabled it in System Preferences to run on battery power, but I discovered it failed to update Mail overnight the next day. I tried closing the lid and coming back to it in a few hours, only to discover that it failed again.