I have a question, and I want to emphasise thar this is not criticism but a request for dive into technicalities.

In the video you mentioned copyparty has an one-way sync tool. Is there a good reason why it’s not two-way, or is this just something you weren’t motivated to do?

I think Copyparty would be great for that purpose. The only thing you’re missing is a way to expose it to the internet, such as a public IP or some tunnel