Achive.Is is a free web page archiving utility that takes snapshots of webpages you feed it. As it notes on it home page,
It takes a ‘snapshot’ of a webpage that will always be online even if the original page disappears.
It saves a text and a graphical copy of the page for better accuracy
and provides a short and reliable link to an unalterable record of any web page
Unlike other archiving sites, Archive.Is acts as a headless browser, so in general it produces more accurate archives of single pages. It also ignores the robots exclusion standard, so you can use it to archive a lot of sites that are otherwise difficult to do so with other archiving systems.
What I especially like about Archive.Is, however, is that once a page has been archived, the user has the ability to download a Zip file of that web page archive.
I use this all the time whenever I blog about something. If I’m referencing or linking to an article, I archive it using Archive.Is, download and extract the zip file contents to a local directory, and then upload that folder to my the /wp-contents/ folders. I then place links to those archival version right in the post itself using the Simple Notes plugin for WordPress.
This allows me to be certain that in the future if I refer back to a post and a link had disappeared, I’ll still have an archived version and be able to update the link to that.