Looking at the current instructions for installing Nextcloud (AiO) on Linux ( How to install the Nextcloud All-in-One on Linux - Nextcloud ), is it necessary to have a “public domain” and non-CGNAT setup even if it’s only for home usage (not to be accessed outside of the home network)? I can’t tell if the install is dependent on it.
A “public domain” may be also a DynDNS Domain.
With regard to CGNAT i can say a non AIO-Setup and non SNAP-Setup works also behind CGNAT with IPv6 only access from WAN. The ACME Let’s Encrypt-challenge does not need IPv4. In fact it prefers IPv6 over IPv4.
The ACME DNS challenge doesn’t require any access from the internet/WAN at all. 
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@bb77 You are so right. I was meaning the ACME Lets’s Encrypt challenge to get and renew a certificate for https.
I’m very lazy when it comes to writing and often use copy and paste, and then I forgot to replace DNS with Let’s Encrypt.
I corrected it now. SORRY
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Well, I do have a DynDNS address, so that could work for me as well.
But I was mainly looking at the AiO option to drop into OpenMediaVault. I’m not even sure if OMV is even necessary (I just want the file shares and a file backup host), but also want to have a Jellyfin server(or rather I’m looking to eventually replace my Fedora-based Jellyfin with something not tainted by RedHat).