James Corbett pushed arcive.org recently, and I had the same question then as I ask you now about archive.fo: How do we know it cannot be corrupted like all other popular services?
We do not know. It is simply the best that I know to do at the moment, and it costs no friction. It could be on lbry but that requires too much effort to get started [now].
Your effort is applauded. I suppose it is possible to save stuff locally, but that could be of little use too in the future for several reasons of course. I do not do that either