Last week, i accidentally bumped into a rather new initiative that wants to archive lost netlabel releases; you can also submit or ask for lost releases: from their website:
"Ever since the existence of digital music, there have been netlabels. Unfortunately, some netlabels don’t last long. Things happen, netlabels disappear, and the music has been wiped from the internet.
This birthed the idea of the Netlabel Archive; a website dedicated to preserving inactive netlabels that no longer have a home online."