I haven’t really paid much attention to Mountain Lion’s new Power Nap feature, until I learned that it will keep my Mac safer, as Power Nap allows Find My Mac to run while it’s sleeping. A stolen Macbook can be run on battery power, so if you want to make it so that it’s more likely to continue running Power Nap, even when the Mac is unplugged, you have to enable it.
Power Nap also lets Time Machine back up hourly while asleep and runs Software Updates once per day. It will also keep all the iCloud stuff we all use synced up and ready to go, including email, calendars, notes, contacts, and reminders.
In case you don’t have this little gem running on your Mac, here’s how to check if it is, and enable it if it isn’t.