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I have a 2TB Seagate external HDD (http://www.amazon.co.uk/dp/B002I3BINU/?tag=cliospnet01-21 this one) which is awesome, and they do a 1TB version for £96 but for the extra £20 you can double your space. You could partition the drive so you have 1 TB for backups and 1TB for general storage which could be an idea
On a general note buying hard drives right now is a bad idea as the prices have sky rocketed and remain high because of the Thailand floods. (I bought my 2TB drive for £99 a year ago )
I generally avoid Western Digital drives as I've had 3 fail on me, but I could just be unlucky with them
For back ups provided that the drive is USB2 and preferably 7200 RPM (Can sometimes be hard to find this out) then you'll be fine.
Do you want a drive to carry about with you, or one you'll leave at home as purely a backup.
If the latter, they may cost more, but a NAS drive (Network attached storage) would be a good idea.
Then you can access the files from any authorised device on the network... and even remotely over da intawebz!