What is the best format settings to store a physical music?
I did look at Flac but the data is almost the same size as the uncompressed Wav and none of my devices or self hosted services seem designed to play flac files. Everything gets converted.
Which compression level are you using? My old server is able to compress flac’s at the highest (and therefore “slowest”) compression level at >50x speed, so bumping the level up shouldn’t be too hard on your CPU.