I have a RockPro64 and 2TB SSD connected with USB. I measure it at around 5,5W so in a month thats ~4 kWh electricity. For storage I think its not feasible to host it on a cloud, see https://jellyfin.org/docs/general/administration/storage/
yt-dlp -x -f 251 https://music.youtube.com/watch?v=9CWTig2kBKE
I upload all my music to a selfhosted Jellyfin server. Finamp is a great Android/iOS app for Jellyfin that has offline play.
buy the same book with another account and compare them. then you should be able to find out where the fingerprint is.