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Yes. There will always be times when the internet isn't there for you. To me, flac file backups are king, and what makes bandcamp so good.

Spotify does allow you to store your songs locally on your smartphone. Although you are of course locked into their ecosystem.

For me it works, for others it may not be adequate.

Spotify seems to regularly delete all my music downloaded to my phone, and it's where I notice right as I'm losing service.