You should use archive.org or archive.today links.

The best way to influence the Domain Authority metric is to improve your site’s overall SEO health, with a particular focus on the quality and quantity of external links pointing to your site.

You can use the Wayback machine addon to easily get archived links https://addons.mozilla.org/en-US/firefox/addon/wayback-machine_new/.

And a bookmarklet for archive.today:

javascript:void(open('https://archive.today/?run=1&url='+encodeURIComponent(document.location)))