Mabe someone will finally get it. You can't trust third-party sites to keep your stuff up. Host it yourself if you want to be sure it's around somewhere. Use free hosting as a backup plan.

Looking at my own and others actual behavioral patterns, I'd say the opposite is more closer to the truth. Dead links often go to someone's old server that they at some point probably planned to keep online forever. But you are of course right in that redundancy is a good thing!