Well, yes, but…
nextcloud forked owncloud back when there was only the php codebase.
opencloud forked owncloud ocis, which is a rewrite in go.
So while both forked “owncloud”, or “something named owncloud”, i doubt they’ll have any code in common.
Owncloud seems to be pretty much over IIRC.
The company behind it got bought be some american company in 2023, that promised that everything will “stay as open as it is” - you won’t believe what happened next ;)
Then recently many of the developers left to join OpenCloud, which seems to be a fork of owncloud, lead by a german open source veteran.
gentoo. i’m not even gonna look this up but i’d be surprised if immolo hasn’t installed in that platform yet ;)
I’m using https://github.com/dracut-crypt-ssh/dracut-crypt-ssh on some of my servers. The initrd opens an ssh port where you can login and enter the passphrase. Setting it up is non-trivial, but it works well. Haven’t tried it on Debian but there should be something similar.