Lisa, reading your post made me nervous lol. What if something happens to your computer? (I've ruined 2 laptops in the past 5 years. I have to have EHDs. I've got a 500GB Seagate that's almost full (probably will be full after I back up all my DSD stuff lol), a 1.5TB Western Digital and a 2TB Seagate. And I put my MOST FAVE pics and kits on my desktop (1TB HD, with a slot for an expansion drive--which I want to get for Christmas!). Anyway, I got sweaty reading your post because I know my track record with laptops. But if you don't have luck with EHDs, then I understand. We have to store our DS stuff however is best for us.
OK, I'm off to back up a few things while the baby is happy and the older one is playing quietly. (What a rare moment!)