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I heard that OS X Mountain Lion on a Mac has a feature called Power Nap :
With Power Nap, your Mac sleeps but your applications stay up to date. So you have the latest information — such as mail, notes, reminders, and messages — when your Mac wakes up. Power Nap performs Time Machine backups to Time Capsule and downloads OS X software updates while your Mac sleeps, so you can begin installing as soon as you wake it up.
Can Windows do the same on a PC?
Does Windows 8 / Windows RT have any new features that can do any special task while it is sleeping?
A Windows 10 Box user, I went to bed around 9:30 PM after specifying Power & Sleep > When plugged in, PC goes to sleep after as 4 hours in Settings, with Box Sync running. In the morning, the program reported that Syncing was accomplished at 3:46 AM. I have to wonder: did the computer actually go to sleep around 1:30 but let Box Sync continue? My understanding is that the clock starts when keyboard or mouse action ceases. – Peter Brown – 2017-12-11T16:38:30.677
23Certainly, by a suitable redefinition of the word "sleep", as Apple seems to have done. – kreemoweet – 2012-09-03T17:49:05.490