Primeiro
No DigitalOcean, devo escolher o aplicativo: Discourse | DigitalOcean Marketplace 1-Click App
Ou devo escolher um Ubuntu 18.04 padrão e instalá-lo usando discourse/docs/INSTALL-cloud.md at main · discourse/discourse · GitHub
Segundo
A melhor maneira de mover o conteúdo. Basta fazer backup e depois importar? Usando
/admin/backups
Using discourse/docs/INSTALL-cloud.md at main · discourse/discourse · GitHub would be the way to go because that is the only officially supported method for now 
Yes, see Create, download, and restore a backup of your Discourse database for more details.
btw: when moving to digtitalocean I will change domain to a subdomain
studmed.dk —> forum.studmed.dk
anything I should be aware of? Except the dns record 
found this: Change the domain name or rename my Discourse?