backing up

Embarrassing, but I've never backed up anything before. It states I should regulary back up my HDD but still confused. How much memory do I need a USB for this to work or are there other ways?:oops:

It all depends on how much space it will take up..I use my I-pod which is and 80 gig sometimes it all comes up to 16 gigs tops when I back up the HD..

ive backed my PS3 up a few times. If you have 50 gig on you HDD then thats pretty much what will go across. Just beware that some data on your HDD will be copywrite material and therefore won be included in the back up.