Archive.is is unironically one of the most important websites in the world. I hope this mess gets fixed but I am not holding my breath because we are in the same position for years now. Interesting read on the probable owner of the site : https://webapps.stackexchange.com/a/149405
If archive.is goes down we have webcitation.org, etched.page, ghostarchive.org, webrecorder.net, etc....