Donate to the internet archive. Then once in a while run some script to check your links, if they fail or pointing to crap link to the archive? Check them again later just incase you got a false positive?
Yea I know it won't work for all links.
Yea I know it won't work for all links.
* make a copy of all linked resources when each post is published
* regularly compare the linked resources to the copies to make sure the links still work as expected
* when a link dies, automatically replace it with a link to the copy