Data-recovery insurance is called "a backup".

There is not much need for me to have copies of information off the 'net. The exceptions are music/movies/books which I don't bother to backup (I just want to have them locally and know where to find them if my local storage dies) and a variety of interesting to me titbits which fit into Evernote quite well. I don't see any point in having a local copy of the Wikipedia and/or Project Gutenberg.