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.
What are people using?
That depends. Are you looking at preserving the music without loss of information? Then you need to use a lossless format like flac. Formats like aac, mp3, opus can throw away information you’re less likely to hear to achieve better compression ratios. Flac can’t, so it needs more storage space to preserve the exact waveform.
You can use a lossy format if you want. On most consumer level equipment, you probably won’t notice a difference. However, if you start to notice artifacting in songs, you’ll need to go back to the originals to re-rip and encode.