Archive.today is doomed to eventually die.
It's estimated the quantity of data under management is 1 petabyte. Given they've been going for around 8-10 years, we can extrapolate this is only 100-150 terabytes per year.
While not completely trivial, this is only 5 or 6 hard drives at today's maximum capacity of 28TB.
What if the developer published the data to a torrent on a monthly or other periodic basis? While not completely legal, it would enable their legacy to live on indefinitely and ensure future access to a lot of information.
[0] Archive.today: on the trail of mysterious guerrilla archivists of the Internet - https://news.ycombinator.com/item?id=37009598 - Aug 2023 (58 comments)
[1] "archive.today is doomed to die" https://blog.archive.today/post/657822115776610304/not-respecting-peoples-privacy-copyright-laws