Is Anything We Make Online Now Going To Exist in the Future?

Here is a question that wrestles with the very odd state in which we find ourselves now: we can currently keep insane quantities of data, but can we keep it for longer than, oh, five years? “I just found out that I have a very serious disease. I may have only a couple of years left, probably no more than five. I have two very young kids. How do I archive stuff on the Web so I know they’ll have access to it, whenever they want, for at least the next 40 years?”