Can this be used to back up data on two different MacBooks?
I would like to back up data on my MacBook Pro and my son's MacBook Air. Can I do that with just one unit (assuming of course I don't exceed 1TB)? Or do I need two of these?
IF you are just backing up data and running time machine then yes. You would create 2 different folders. I always recommend running time machine which requires its own external hard drive. It backs up your entire system