There isn’t a reason you can’t use those same services for downloading any content you want. If you are using a front end of some kind, you can just try sourcing the content yourself and using a music streaming app. It’s been awhile since I’ve looked into it, but there was subsonic. Also, most of the video servers like emby and plex also support music.

KVM/Qemu and Hyper-V also have snapshots, but hyper-v has a dumb name for them that I always forget.

I wouldn’t recommend it due to complexity, but clevis is a thing. It permits a machine to automatically unlock on boot when various environment conditions are met.

Honest question, what are you using that is only available from snap?

Snap is almost universally despised with host, flatpack and appimage usually being preferred.