There are tools like gocryptfs or cryfs that solve that problem to a degree. cryfs even makes the directory structure and file names opaque with chunking the encrypted data in small blocks but this turns quickly into a benchmark of your sync software (i.e. don't use it with Nextcloud, the client can't cope well and fast with lot's of small files at least for the initial sync). Not sure if syncthing is better.
Didn't came around to testing gocryptfs, but if you don't need the chunking it looks like the better alternative.
https://nuetzlich.net/gocryptfs/comparison/ https://www.cryfs.org/comparison
This is the blocker for me too. Support for a zero knowledge server where even if someone gets access to the filesystem on the server, they can only see it encrypted.
Other than that, Syncthing is absolutely amazing!
I would like to mix it. Then my desktop could be a mirror for my friend without knowing his files and vice versa.
Is there any other solution that is capable of exactly that?
The only thing missing is an encrypted external sync node so I can put it on a VPS somewhere