Sounds like you've already done it, but info for anyone else that needs it:

you can preserve sites on the wayback machine. There's a "save page" section on the front page, you can enter a url and it will save a copy. You need to do it for every page of your site though. And you can repeat it every time you change your site so it can act as a history of your site.

https://web.archive.org
https://help.archive.org/help/save-pages-in-the-wayback-machine/