MacMost Q&A Forum • View All Forum Questions • Ask a Question 10/12/091:48 pm About How big of a external hard drive to I need for my macbook 2.4 It has a 250 GB hard drive. — Gary McNeil Comments: 3 Responses to “About How big of a external hard drive to I need for my macbook 2.4” Gary Rosenzweig 10 years ago It already has a 250GB drive, and you want to buy an external one — for what? The size depends on what you want to use it for. Gary McNeil 10 years ago I want to use it for time machine sorry forgot to put that. Gary Rosenzweig 10 years ago I recommend getting a drive that is at least twice the size. But with the cost of drives being so cheap, I wouldn’t buy a drive today that is less then 1TB anyway. Comments Closed.