As most of you have probably noticed from my previous posts. I'm pretty dumb when it comes to all things pc/mac. But I think it is about time I bought some sort of backup device for my new imac. Foolishly I never ever backed up my old pc during 10 years of ownership. But luckily never lost any data either! I am looking at western digital 'passport' (500gb). But as I have a base 21" model with 1tb drive. Does the back up have to be the same size?(to work with time machine thingy) The reason I'm asking this is because on my old pc with 500mb HDD I never filled that in all the years I had it!! (Embarrassing I know!) The other question I have is. I have a refurb AirPort Extreme base station on order as I am having some connectivity problems with my Apple TV mainly! Should I cancel and go for the apple time capsule instead? Money is a factor. And I just think the apple time capsule is rather expensive!! Any advice would be most appreciated. And please excuse my ignorance!! Ps. Forgot to mention. I would like to get something as soon as poss. As I have an exchange imac on its way to me. And I really don't want to go through the data transfer process again. Found it a bit problematic. And apple must be fed up with me constantly phoning for advice!!