low power storage and media solution

[Enquiries]

I am looking for a solution for the following needs:
- I have a lot of files and media storage I want to save but also have available throughout my home
- main media are photos, music, and videos (DVD type movies, no bluray)
- I have various consumption stations which include: TV, 2 laptops, 1 desktop
- I want it available on LAN only, no WAN or remote
- expandability is important since I want to keep the system for at least 5y
- MOST IMPORTANT - I want a very low power consumption on idle. electricity prices are outrageous where I live

I don't mind building and maintaining a system but most DIY systems have higher power consumption than brand options.

I was thinking a Flashstor 6 since I see it has low power - 0.85W idle to 26W normal usage.

Thanks for the help.