There is already quite a good plugin available by Berkman, Harvard University related to what author's idea seem to be. It works with Drupal as well as Wordpress upon which I worked as my GSoC project (nginx/httpd modules as well). http://amberlink.org
It use Archive and local copies as backend, while had ideas to support IPFS among others.
What Amber does?
Amber is an open source tool for websites to provide their visitors persistent routes to information. It automatically preserves a snapshot of every page linked to on a website, giving visitors a fallback option if links become inaccessible.
If one of the pages linked to on this website were to ever go down, Amber can provide visitors with access to an alternate version. This safeguards the promise of the URL: that information placed online can remain there, even amidst network or endpoint disruptions.