From Jason at Lightstalking we get this article addressing the problems of image storage when travelling. I think all his options are good, as with everything to do with photography all options are ultimately a compromise of some sort. I have found that travelling with a card reader and a stack of data sticks is the answer. They are suitably cheap now, 7 Day Shop have 64gb USB sticks for less than £13, I usually download in an internet cafe or hotel computer and put my images on 2 sticks for back up and keep them in different places in my luggage. Anyway here are the 5 suggestions from LS
Travelling with your camera is one of the great pleasures in life. Capturing the sights and emotions of far flung cultures is a great way of learning and understanding the world around you. When you are travelling, photography seems somehow easier, you take more images and often lose the self consciousness that you may have at home. However, with this glut of new shots, how can you manage them whilst on the move? I am sure many of us have experienced the pain of a failed card or drive, a pain that would be intensified if it were to happen on a trip of a lifetime. So what are your options?
Laptop and a Spare Drive
This is perhaps the most efficient option but also the heaviest and, of course, there is the risk that your laptop could get stolen. However, with small form factor and powerful laptops available such as the Apple Air series, combined with software such as Lightroom and a spare external hard-drive to back up to, this can be a great option. Some of the advantages here are not having to worry too much about hard drive space, the ability to catalogue and keyword your shots whilst away and being able to do some image post production work, the last two being significant time savers for when you return home.