Check Borg documentation. Somewhere there there’s a way to pass the password as an environmental variable.

Ehem. https://masto.kukei.eu is not great but it is an honest work

Punycode would work here better I think as it’s plain ASCI with no special characters except a dash if I recall correctly.

Yeah. For major things. For trivial stuff like choosing lunch place people usually do public voting.

Here’s my way of doing it. TLDR: LUKS with a encryption key hosted in my router

https://nowicki.io/self-hosting-lvm-raid1-with-key-over-ftp/

So it was DNS?