Upload & Sell: Off
I use a laptop and internet cafe to upload to my servers at home, but you could use SkyDrive, Googel Drive, Drop Box, etc. just as easily.
I usually update the website same way, just works.
If you don't want to take anything heavy, try the new chromebooks which are internet only, but really light and cheap!
But that only works if you stay in the cities all the time When being out in the nature, backpacking, trekking or similar things. You will not find any internet cafe.
For me a real backup is when I have control over it.