Archive.org has had it's fair share of problems recently as well. I'm still mad Google dropped their own cache and just expected the IA to pick up the slack.

Having said that, there are a variety of different archives that Wikipedia uses for backups - Perma.cc is included on that list. https://en.m.wikipedia.org/wiki/Wikipedia:List_of_web_archiv...

There's also projects like Archive Box that allows for self hosted backups of websites https://archivebox.io/