I have also been building a personal collection of exclusively FLACs, be it for a lot less than 25 years. It's past 1TB but https://www.navidrome.org as the server and https://symfonium.app as the client has been great.

Granted, 2TB sd cards are now a thing so once they come down in price, I'll probably get one.

Never seen Symfonium before going to have to give that a try looks great!.

I've been using Plex+PlexAmp for a while but have been really wanting to move to something outside of that.