Originally Posted By: Mark_R
External hard drive (remember that this is a one-way trip): 1/2 lb (optional. Copies of critical files can be carried on a smart phone memory card)

I would invest in a bunch of SD (TF) cards in 64Gb capacity each instead. They are dirt cheap today ($6 shipped). And make a library of your files stored by category. That's more versatile, lightweight, and much more reliable than mechanical hard drive. 1TB is usually more than enough for everything one could accomulate in a lifetime (except HD movies library of course smile ) 1000/64*6 = $93 - less than twice the cost of 1TB HDD and weighting nothing (0.3 oz). They also might have a trade value far exceeding $6.