There's a fantastic extension for Firefox, Chrome, etc. called Web Archives which will attempt to find a copy of the missing page from the Wayback Machine, Goog

There's a fantastic extension for Firefox, Chrome, etc. called Web Archives which will attempt to find a copy of the missing page from the Wayback Machine, Google Cache, Archive.is and many more. https://github.com/dessant/web-archives https://github.com/dessant/web-archives