For give me for such questions but I'm new to Mac & OSX.... I have a 1 week old iMac 2.8ghz 21.5" system. I just purchased a "G Drive" and have it all set up & it has already backed up my system. My concerns lie with how it works 1) When time machine is doing a back up can the computer still go to sleep? If so, when it wakes will G Drive resume where it stopped? 2) Similarly, when I shut down the computer for the day, will G Drive resume backing up if it was active prior to shutting down?