I will be adding more information as I learn more. This is a summary of the knowledge on the subject I have gained so far. Wayback machine This is an obvious go-to website where you can see historic versions of sites. It is run by Internet Archive non-profit digital library. https://archive.org/web/ Google cache You can see cached version of sites in Google search by clicking the little down-arrow next to the URL.
After trying out different ACME clients, like dehydrated or getssl, I always came back to certbot. But now, I have finally switched to acme.sh, which, as a simple shell script, is compatible with my KISS ideology. It is used by some big projects like FreeBSD and Proxmox, for their SSL needs. Lots of features Out of the box, you get support for over 70 DNS hooks (from cloud providers like Amazon to actual software like PowerDNS).