What Power Nap Can Do on Your Mac?

It may be favorable to sleep not only for people but also for computers. For example, the Power Nap application helps Mac perform useful actions even in the sleep mode.

How Power Nap works

If your Mac computer supports the Power Nap feature, then in sleep mode it can:

  • Receive new messages via e-mail;
  • Synchronize contacts, data, and documents between different devices’
  • Receive calendar updates and new invitations;
  • Update Mac location in Find My Mac so that it can be found in a sleep mode;
  • Block and erase data from Apple computer remotely;

and so much more!

Moreover, if Mac in sleep mode is plugged into a power outlet, it can:

  • Download updates to applications and Mac App Store objects (including software updates);
  • Back up using Time Machine;
  • Index files in Spotlight;
  • Update the Help Center;
  • Wake Mac up from the sleep mode using Wake on Wireless (by wireless base stations).

While Power Nap operation, no external sounds will disturb you. If the Mac is equipped with a hard drive or a Fusion Drive, its operation and shutdown can be accompanied by a slight noise.

While the Power Nap function is on, Mac computer may get warm even in a sleep mode. When its temperature reaches a predetermined level, the application function will be suspended in order to avoid overheating. When the Mac exits the sleep mode, it will be ready to work immediately.

The Power Nap is supported by the following Mac models:

  • MacBook Air (Late 2010 and later; requires OS X Mountain Lion 10.8.2 and later);
  • Mac mini (Late 2012 and later);
  • iMac (Late 2012 and later);
  • Mac Pro (Late 2013);
  • MacBook (Early 2015 and later);
  • MacBook Pro (all models with Retina display).

How to enable and disable Power Nap

To manage Power Nap, you will need to get to a menu located on the Energy Saving panel of the System Preferences.

Desktops

Open Apple menu → System Preferences → Energy Saver. Put a tick next to the Enable Power Nap line to turn the application on or off. By default, it is on if the Mac desktop is equipped with the flash storage (excluding Fusion Drive).

Macbook Laptops

Open Apple menu → System Preferences → Energy Saver. Go to the Battery tab and check the Enable Power Nap while on battery power box. By default, it is off.

Then select the Power Adapter tab and check the Enable Power Nap while plugged into a power adapter box. By default, it is on.

enable power nap
Source: computers.tutsplus.com

Good to know

  • It should be noted that the Power Nap work depends on the battery charge level and the year the laptop was manufactured in.
  • On 2013th or later computers, the Power Nap function works until the battery is depleted. On the 2012th or earlier versions, the Power Nap will stop if the battery charge is 30% or less.
  • To increase the battery life when using Power Nap, unplug all USB, FireWire or Thunderbolt devices that can consume battery power.
  • 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.
  • Backup using Time Machine starts every hour before a successful backup is created.
  • Software updates checkups are performed once a day.
  • Downloads from the Mac App Store are checked weekly.
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