People often compare the shutting down of sites or the banning of content (e.g. When Tumblr banned porn, or now yahoo shutting down groups) to the burning of the Library of Alexandria. But there is a huge difference. The LoA held knowledge collated and collected by the best thinkers of the time. The Internet is not that. The Internet is an open platform where anybody can say anything like that. Most comment sections are filled with all sorts of material ranging from factual to entirely fictional.
I realise it is hard to decide what is worth keeping (and therefore erring on the side of saving it all), but I'd wager that the vast majority of archived content is not useful at all. The Wayback machine is a perfect example. Lots of great stuff, but that's a drop in the bucket compared to the vast amounts of useless, or even redundant information stored.
It is a lot of resources thrown at saving, not the equivalent of the Library of Alexandria, but the public toilet block graffiti wall.
Anybody want to share what drives them to do this?