Given the huge amount of URLs from a variety of websites, it's a good idea to introduce a bot that can provide archive URLs. This may require many works.
|Open||Cyberpower678||T120433 Migrate dead external links to archives|
|Open||Cyberpower678||T136130 Add IABot support for other wikis (tracking)|
|Open||Cyberpower678||T143488 Save contents of URLs linked from Wikidata in the Internet Archive|
|Open||Cyberpower678||T187611 Adapt InternetArchiveBot to Wikidata|
For information: this should be done per property, as some properties is not appropriate to be archived (email, archive URL, irc, etc); by contrast, external IDs may be useful to be archived if the target page includes some useful information.