We backed up Spotify (metadata and music files). It’s distributed in bulk torrents (~300TB). It’s the world’s first “preservation archive” for music which is fully open (meaning it can easily be mirrored by anyone with enough disk space), with 86 million music files, representing around 99.6% of listens.
I hope (also assume since it hasn’t been taken down yet) it’s more of a decentralised deal with servers in many places and backups in every nation under the sun