As for myself, I simply save the article on my hd in html, then I
make a link from my browser to the file in my hd...
Then I can enjoy the article as long as I want and I can even send it to
friends or copy/paste it when I write an article!
That works for private use. stallman.org is a web site with political
notes that have links to relevant articles; saving my own copy
wouldn't do the job.