I think that online services like Wayback Machine/Archive.org will save some crypto related websites that are gone.I'm not 100% sure though.I'm not interested into saving any cryptocurrency related websites,videos or articles.I guess that,if some sort of info is on the internet,it's going to stay on the internet forever. 
archive.org it could be down or hacked, nothing is really safe when storing it online.I just want to save my soft files on the hard drive that only I can access.