OP,
I would purchase as little storage as possible. As soon as I got my streamers… transferred some of my files to my Aurenders and then haven’t used them since. Streaming sounds the same or better through Qobuz.
I think I had to reboot my router a year or two ago and played internal files for a little while.
It’s nice to know you have something to play, just in case. But there isn’t much of a reason. If you have special recordings… well, that may not last long as it is likely you will get lost in the hundreds of thousands of high resolution albums and groups you have never heard of before. At least this is the path I took and many others.