I will be purchasing a MacBook soon and I have just a few questions about the Mac OS and such. I have used the Mac OS a few times before, but I am not used to using it as my permanent operating system, so I am preparing myself for the switch. -Do I need to do maintenance on the system such as cleaning up old, temporary files and defragmenting my hard drive, or does the MacOS do this for you? If not, how would I go about doing this and how often should I? -Are the MacBooks setup to automatically go to sleep mode when you shut the lid by default, or do you have to change this in settings manually? If so, how? -I've also heard of a feature called Deep Sleep. What's the difference in this and regular Sleep? -What is a good way to keep the MacBook clean. I know how to clean the external parts properly. Should I blow some compressed air into the vents and such to keep them cleared out ever so often? Thanks for your help! If you have any more tips on how to keep MacBooks and Mac OS in tip-top shape I would appreciate them.