An anonymous reader writes "The common trope these days is that the internet never forgets. We tech-inclined folk warn our friends and relatives that anything embarrassing they put on the internet will stay there whether they want it to or not. But at the same time, we're told about massive amounts of data being lost as storage services go out of business or as the media it's stored on degrades and fails. There are organizations like the Internet Archive putting a huge amount of effort into saving everything that can be saved, and they're not getting all of it. My question is this: how long can we reasonably expect the internet to remember us? Assume, of course, that we're not doing anything particularly famous or notable — just normal people leading normal lives. Will our great-grandkids be able to trace our online presence? Will all your publicly-posted photos be viewable in 50 years, or just the one of you tripping over a sheep and falling into the mud?"