While 300 TB comprising roughly 86 million music files, which the group claims represent about 99.6 percent of Spotify’s listens, is a vast amount of audio, it falls well short of the platform’s full catalog. Anna’s Archive says Spotify contains around 256 million tracks in total, meaning the audio files it archived cover only about a third of the catalog, with the remaining tracks represented only in metadata rather than preserved as music files.

By not bothering with all the musical chaff in Spotify's catalog, the Anna's Archive team is apparently content to let those less popular songs languish despite their claim to want to avoid focusing on just the most popular artists.