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I put together this guide for my own reference for future Virtualmin installs. It covers how to deploy Letsencrypt for virtual domains using built-in Webmin, Virtualmin modules for Letsencrypt and SSL management. I also use Webmin cron module for scheduling updating Letsencrypt and renewing certificates. Goes over how to backup Letsencrypt and SSL certs for domains using Webmin filesystem backup and Virtualmin backup.
https://joealdeguer.com/how-to-install-and-setup-letsencrypt-for-virtual...