The UI only allows entering a couple archive services into the archive URL field such as Wayback and Webcite. There are a few dozen legit archive services, and new one's keep appearing.
The List of domains can be found here:
https://en.wikipedia.org/wiki/Module:Webarchive
Search on: function serviceName
I keep this list up to date as I discover new services. Another good source is
https://en.wikipedia.org/wiki/List_of_Web_archiving_initiatives
Though it is missing some like wikiwix