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Build 12C43 of OS X Mountain Lion 10.8.2 beta was seeded with no known issues, however it appears Apple is looking to improve operability of the Power Nap feature introduced with the operating system in July.
Power Nap enables Macs to stay up to date and allows for the automatic backup of data while the computer is in sleep mode. Time Machine and iCloud syncing are supported, though compatibility is limited to mid-2011 or later MacBook Airs and the MacBook Pro with Retina display.