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Check out croc, a slick little tool to allow you to send files from one computer to another. No port forwarding, encryption built in.
That's a really interesting project.
As I paged through the documents, I couldn't find how long nor where files are stored during transfer. It kinda seems like they get stored (in encrypted form) in the guy's closet server.
Don't suppose you can speak to this?
Reading through the code, you can start your own relay server. The relay server code should be part of the repo then.
If the files are E2E encrypted, I assume they are useless to the person that is hosting the server.
(Disclaimer, I've not reviewed the code, don't quote)
Files can be transferred via P2P connection without them being uploaded first to a third location. I assume though that some sort of server serves as a matchmaker allowing two computers find each other when the connection is established
That's exactly what the relay server is, it just relays communication details. And you can run your own relay server if you don't want to use his public relay server.