I would like to point people to the Odroid H4 series of boards. N97 or N355, 2*2.5GbE, 4*SATA, 2 W in idle. Also has extension boards to turn it into a router for example.
The developer hardkernel also publishes all relevant info such as board schematics.
I am building a NAS using the Odroid H4+ and a 3d printable case design. I selected the Odroid board for the in-band ECC and low power consumption: https://www.printables.com/model/1257966-odroid-h4-nas
Yep, I've had mine running for over a year now without issue. It idles at 34w with all 4 drives running. I ended up making a custom "case" for it: https://github.com/cbsmith402/storage-loaf
I also have an older Odroid HC4, it's been years it is running smoothly and not only I cannot use 1000$ for a NAS as the current post implied but the power consumption seems crazy to me for a mere disk-over-network usage (using a 500W power supply).
I like the extensive benchmark from hardkernel, the only issue is that any ARM-based product is very tricky to boot and the only savior is armbian.
I've had an H3 for a few years and it runs amazing. Very low power usage, small footprint and great stability. I run it with an M.2 ssd for power considerations.
Before that I had a full size NAS with an efficient Fujitsi motherboard, pico-psu, 12V adaptor and spinning HDD's. That required so much extra work for so little power efficiency gains vs the Odroid.
And the best feature is they have in-band ECC, which can correct one-bit and detect two-bit errors. No other Alder Lake-N or Twin Lake SBC exposes this feature in UEFI.