Yes! Just mentioned, you right thanks!
It is mATX but yes, not enough ports.
Your selection is solid. Ither than the RAM issue as @Farout mentioned.
Also check local ads. I am sure there is a local Italian market website. You can find cheaper stuff there with some patience.
Big issue now is that udimm ecc ram have CRAZY prices and few options where to buy… a lot of options instead for rdimm…
It would be much better a motherboard that accept RDIMM DDRs…moreover it would be better for ecc error correction and stability…
I thought you have the RAM already. Or am I mistaken? How much RAM do you need?
What is your use case for the NAS? Just a file server or something else?
I have sodimm 64gb ECC Udimm…need physical sodimm to dimm adapter…
But…
At the end I bought everything!
These ram, 184 euro:
This mobo, 206 euro:
ASRock Rack E3C246D4U2-2T LGA1151 8xSATA Dual DDR4 mATX 10GbE supporto Server NA
This CPU, 49 euro:
Intel Xeon E-2176G SR3WS processore CPU decktop 6 core 3,7 GHz Turbo FCLGA1151
Let’s wait everything to arrive….in the meantime I send back everything, I just keep the Jonsbo n6 case…
about the PSU: 650W should be more than enough no?
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Should - but how many disks? Usually 650W only includes 12v, but HDD/SSD also include 3.3 & 5v. Very rare, but it can in theory be an issue.
Realistically, any reasonable 650w PSU should be enough for ~8 HDDs without doing any math.
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https://seasonic.com/focus-plus-platinum/
12v 2 amps startup - 16 amps startup on 12v… more than in spec, even with 20 amps on 5v, I think you’re good with that PSU 
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Is that still the plan?
The Lexar 790NM is an NVMe SSD but the E3C246D4U2-2T you say you bought has a SATA-only M.2-slot.
Also, keep in mind that on that motherboard the M.2 slot is shared with SATA port #0, which means that using the M.2 means you can’t use more than 7 of the ordinary SATA ports. Did you get an HBA as well or are you going to do some USB-shenanigans for your boot device?
Edit: I was mistaken.
Edit
No. Is not like that.
I’ve just read the manual and if you connect a pci express m.2 ssd, the sata bus stays free for the sata0 hdd.
You lose one sata hdd connection only if you connect a sata m.2 ssd device, if you use a pci express one no problem.
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Right, which lines up with what I said.
You haven’t mentioned ultimately buying any PCIe card so I asked you what your plan related to that was.
Edit: I was mistaken.
No, I don’t need any additional card.
The Mobo DO support m.2 pci express ssd, without losing any sata port.
It supports PCIE3.0 x4 or sata for m.2
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NO.
This is the usual combination of x4 PCIe lanes (from chipset) plus one SATA lane, shared with a SATA port. With a SATA M.2, one SATA port is disabled. With a NVMe M.2, one gets the full 8 SATA ports.
Just get something smaller as 2 TB just for boot is needless overkill.
I looked and looked at this yesterday and did not spot the line that so clearly says:
M.2 slot - (2230/2242/2260/2280, Supports PCIE3.0(X4)/SATA3)
With that detail things change.
You are all quite right.
Thanks you everyone for the suggestions.
At the end I opted for a Corsair SF750 as psu (80+ platinum) and I’m evaluating and AIO 240 for cpu heatsink
IMO AIOs are not suitable for a 24/7 operation.
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In such a case I was thinking of a thermalright AXP 120 x67
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Whatever CPU aircooler fits in the case… By current standards, LGA1151-2 CPUs are not that hot or difficult to cool.