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’ve had Spotify since it basically released. I fully switched to a self hosted music library about 5 months ago. I imagine I’ve supported artists more in those 5 months than I did during my 18-ish years of Spotify premium. I still use Soulseek for large artists or quite old albums, but most new releases and remix tracks I pay for.