Just wanna know. A lot of people ask me this question, but IDK what to answer.
Do you use an additional encryption (server side encryption) or do you only want an answer for the normal nextcloud without server-side-encryption?
For the normal nextcloud (default installation without server-side-encryption) all data is transport-encrypted if you use (and only use) https. You shoud configure your webserver (apache2/nginx) in the way that http is always rewrite to https. Nobody users in 2020 http.