It’s very easy to move Let’s Encrypt SSL certificates to new server. If you don’t know who Let’s Encrypt certificate authority is… read up here.
All you need to do install Let’s Encrypt on new serer first, then transfer the following directories to same location on new server.
- /etc/letsencrypt/archive/$SITE
- /etc/letsencrypt/live/$SITE
- /etc/letsencrypt/renewal/$SITE.conf
Edit /etc/letsencrypt/renewal/$SITE.conf file and replace the string in “account =” with the folder name from /etc/letsencrypt/accounts/acme-v01.api.letsencrypt.org/directory/.