Pretty funny that coming from a Norwegian because they still have the flag out many places in my opinion :)
It's actually one of the things that stuck out the most after I had moved there.
Especially at "hytter" (vacation cabins) I think the majority has a flag out.
Same for national day, you'll see a bunch of flags.
Compare that to Belgium, where I'm from. Even on national day it's a rare sight to see a flag.
And it's only very fanatic people that will actually wave it around on the street.
The moment you'll see most flags out is probably during the world cup.
I recently wrote a blog post about the new NAS I built myself and why I didn't choose for a RPI 4. https://jeroenpelgrims.com/diy-nas/
I think it terms of price it won't be much more expensive than an RPI NAS, but you'll get more performance and stability.
If you don't care about power usage and/or connecting stuff through USB you can also buy some older hardware instead.