I know of an online music collection that would need to be archived. Maybe by these people?
There is an amateur enthusiast named Steven Kozobarich who restored some very early recordings of traditional Balkan music. His Youtube channel is the only remaining place where copies of the songs are still reachable.
He used to maintain a blog-like website the previous decade, and it still remains, but the links to the external hosting service (with the tracks) don't work anymore.
Link to his channel: