You can set up a NAS plugged into your router and access it from any where, That’s what I did and it has movies and music loaded up as a media server.
See:
https://www.amazon.com/gp/product/B00JKM0ES2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
If you are getting a second streamer stay with the Bluos OS, either Bluesound or NAD products. I have a Node and it is OK, the NAD C-658 is a big step up in SQ and has Dirac room correction too. I would put the NAD in the dungeon and move the Node to the secondary system. If you have questions on setting up the NAS just post.