Help:Archiving a source
On Wikipedia you can archive sources to prevent link rot.
Finding an archived source
You can use time travel to find an archive.
WebCite is an on-demand web archiving service located at https://www.webcitation.org/. By using WebCite, Wikipedia editors can reduce link rot by preserving a copy of an online source that can be accessed if the original page is moved, changes, or disappears. Not all web pages can be archived, however.
Internet Archive Wayback Machine
The Wayback Machine is a service which can be used to cite archived copies of web pages used by articles. This is useful if a web page has changed, moved, or disappeared; links to the original content can be retained.
Editors are also encouraged to add an archive link as a part of each citation, or at least submit the referenced URL for archiving, at the same time that each citation is created or updated. (New URLs added to Wikipedia articles (but not other pages) are usually automatically archived by a bot.)
Visit the web form at https://web.archive.org/ , enter the original URL of the web page of interest in the "Wayback Machine" search box and then select BROWSE HISTORY. The next screen may,
- redirect to the latest archived copy,
- show a box near the bottom of the page with a link inviting the user to
Save this url in the Wayback Machine,
- show a calendar listing the snapshot dates for all archived copies of that page, or
- show an error message explaining why the page cannot be archived.
In short, this is the code that needs to be added to a reference:
archive.is is an on-demand web archiving service at http://archive.is/. A web archiving service allows Wikipedia editors to reduce link rot by preserving a copy of an online source that can be accessed if the original page is moved, changes, or disappears. Not all web pages can be archived using archive.is.