I'm not actually sure how to do that on Spotify. But for albums I like, especially lesser-known artists making music of various kinds (I tend to lean heavily to

I'm not actually sure how to do that on Spotify. But for albums I like, especially lesser-known artists making music of various kinds (I tend to lean heavily towards electronic music broadly described as "experimental"), I generally just buy them on Bandcamp and put a copy on my NAS.