I've been burned before when I link to a web page in this blog and then it disappears. (I'm talking about YOU Microsoft.) Sometimes I will even screen capture the pertinent parts of the web page and present it as a jpeg.
Recently I came across this article in Lifehacker that mentioned archive.is.
The idea is that archive.is will go capture the web page at the point in time and give you a shortcut to it. Further you can download a zip file with a stand-alone presentation of it.
Here is the archive.is copy of the Lifehacker article.
You still have the risk that archive.is goes away. I don't see any ads so I'm not sure of the business model.