Hi ollie
Have is got to very portable. I use a Iomega 160GB USB-2 hard drive for carrying my work with me and it doubles as a back-up for everything. Mine is mains but you can get a USB powered version for a little more. Itr has worked perfectly for a year or more and it comes with some excellent soft-ware for auto-backup. Calms the nerves! If it's too heavy there are much more portable smaller ones that would be ideal for travelling and more are coming out all the time. How much capacity do you need?
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