What I do is back up a list of songs. I don't want another Grooveshark event, which went down from one day to the next with all my music gone. (I didn't see it coming because, from my point of view, it was like YouTube: artists can sign up to get paid, or to take down their music piecemeal as people reupload it.) Too bad if Spotify disappears and I need to spend a weekend re-adding everything to another service, but that's the legal and easy and low-storage way to back this up

I don't remember what the tool was called but it was just a static webpage that talked to the Spotify api, dead simple to use if you know how to register a developer token. Looking for it now, ironically I only find things that will download the songs for you... that need ffmpeg etc... Here's the first github link I found in case that's what you're looking for https://github.com/spotDL/spotify-downloader but it's not the one I meant/used. I'd have to check on my desktop later if you're interested