Best value for what is needed is any decent PC with adequate USB disk storage for main and backup copies accessed via a network connection.
The server only serves data the same as any client/server computer application. No music is made on or by the server.
The client player device/streamer and its associated DAC and connection is where the music is made and difference in sound quality will occur, so this the place to focus on for good sound quality, assuming the rest of the audio component chain downstream is up to par already.
The server only serves data the same as any client/server computer application. No music is made on or by the server.
The client player device/streamer and its associated DAC and connection is where the music is made and difference in sound quality will occur, so this the place to focus on for good sound quality, assuming the rest of the audio component chain downstream is up to par already.