I am streaming , how can I play music when provider goes down.

You "network guys" are something else.

I did home automation, distributed audio, home theater, security, etc. for several decades. Each time I’d attend (required) vendor training sessions on networking gear, I considered myself an expert for at least 45 minutes after the session was over. Then it was back to what I did best: configuring devices that made noise, or produced an image.

It could have been childhood trauma, but the "networking" section of my brain didn’t fully develop. You guys who can sling data around a home (without dropouts and dead spots) deserve accolades and (financial) rewards. You’ve earned it. These days, devices that make noise or produce images don’t make noise or produce images without a stable, reliable network. You win!

Audioman:  if you are referring to your internet service, its going down should not keep you from accessing local files.  What you are seeing is that Roon stops working when the Internet is down.  What you need is a Roon alternative that plays local files from your network.

Foorbar2000 is one of the simplest.  J. River also well known.  Plex the most sophisticated from a network perspective.  The all take configuration and knowing basic network - like how to find a NAS over wifi or ethernet. 

If your fanless computer is Windows or Mac you'll be able to set something up that allows you to have a similar local file experience to Roon.  If you're using Rock or have a Nucleus (Roon OS computer) then you won't be able to use it for much else and you'll need another computing device of some sort.  Many streamers will support local files.

What you want to do is pretty basic to a digital audio veteran.  But yeah it's a new world from analog or if Roon was plug n play for you.  Try Plex...

That’s why I purchased a streamer that also allowed me to rip my cd’s. I can stream Tidal and also source my cd collection. I sold my cd transport since it was no longer needed.

Vinyl or 8 track? Who remembers the Elcaset?

FWIW, I have AT&T gigabit fiber. So far, about 5 years, it has been remarkably reliable.

You can stream your files from a NAS to any streamer (in the local network) just fine when your ISP is completely dead and gone with the wind!

On the same note dude, if you like an album, buy the artist's hires digital album (put it on your nas) and pay the artist. These streaming services pay them peanuts. On a positive note, you will have permanent ownership of that album and will no longer be "renting" it from the streaming service.