The US government already does this. Presumably, many governments do, but I've only ever worked for the US, so it's the only one I know of. Every day, the NSA does a dump of Wikipedia, the Stack Exchange network, and God knows what else to import into self-hosted versions of clone sites on classified networks, so US intelligence and military personnel can access this information without needing an Internet connection. The places these get hosted are already inside of military installations, in SCIFs that are behind several-foot thick concrete and radiation shielding that is probably quite a bit more likely than you to survive some kind of event that otherwise collapses civilization. They, of course, also have all of the military field manuals and technical manuals that more or less form a complete guide to how to survive in the wild with no equipment.
That said, I still think I understand why individuals like to do this kind of thing. You're not really concerned about human civilization itself preserving its structures and knowledge. You're concerned about the possibility that you personally will survive some civilization ending event and whatever is left of global militaries and various larger-scale data archiving systems won't care about you or have any way to share the information.
Just be warned, as someone with past experience being in the military and having to actually do these "remote survival with no gear" things, just reading about it is typically not enough to succeed on your first try. You need practice, and it helps quite a bit to have friends, co-workers, some sort of trusted companions who have at least as much and ideally more experience than you. Whoever figures out how to build the first new piece of "technology X" after catastrophe wipes out the last one we had before is far more likely to be someone who built this kind of thing before than someone who spent the pre-apocalypse data hoarding but never actually practicing what they're trying to learn how to do.