I really just want to use it as a hard drive that I can occasionally use as a laptop. It would normally just sit in a cupboard doing nothing. I have an Asus Ultrabook that I use for work. It's great because I travel a lot but the hard drive is samall. My plan was to have a 1TB laptop. Then periodically transfer everything from my Asus to the 1TB so I can keep the Asus nice and empty and then back up the 1TB onto an external HD. So I have everything on the 1TB and available should I need it. Plus it's all backed up.
My other thought was to buy two external hardrives one to keep everything on and one to back it up. Can you back up an external hard drive with another external hard drive?
At the moment everything I have is on a very dodgy old Vaio that's on its last legs.