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 buy at least 5 cds a month from groups I like. Usually on bandcamp or the artist website. Usually smaller groups. If theyre massively famous or were hugely successful 40 years ago I may not purchase it though. Or get a used copy.