like just, do what OCRemix does and have their whole catalogue preserved as a series of torrents so that even if their site goes down the work is preserved in a distributed manner so that you can probably find it again at least.
I feel like as far as availability goes, a well-seeded torrent is one of the more accessible ways to do it. Have a bunch of artists organize their files in a consistent folder setup and then have them all share a torrent so that the people seeding for really popular artists are also seeding for less popular ones.