It is enabled by default on supported computers when connected to AC power. Power Nap can be turned on or off in the Energy Saver pane of System Preferences. Note: If you use the Play Sound or Send Message feature of Find My Mac, Power Nap does not make a sound. When Power Nap is doing its job, the system sounds are silent and no lights or fans come on. When your portable Mac is connected to a power source, it also downloads software updates, makes backups with Time Machine, performs Spotlight indexing, and it can continue Mac App Store downloads. Power Nap does more when your Mac is plugged in to an AC outlet Macs in managed environments can receive configuration profile updates. Locate a lost Mac notebook even when it’s sleeping. ![]() Your Mac notebook can back up while it sleeps. Your Mac notebook can download updates from the Mac App Store. Your Photo Stream updates with new photos from your iPhone, iPad, or iPod touch. iCloud pushes any edits you made to a document to your Mac notebook. Notes updates with any changes you may have made on another device. ![]() Reminders updates with any changes you may have made on another device. Receive new invitations and calendar updates. Your Contacts update with any changes you may have made on another device. When your compatible Mac goes to sleep in Mountain Lion, Power Nap still gets things done silently
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