[wim]

Thanks for the hints. Looking at QNAP, this product looks interesting:

https://www.qnap.com/en/product/tr-004

It's more expensive than Fantect, but still a low figure.

This is more a direct storage type of attachment rather than a NAS. However, I'd certainly recommend QNAP over Fantec, no doubt at all.

If you want NAS-type of faciltities above storage attachment alone, you may want to consider the TS-431K: https://www.qnap.com/en/product/ts-431k/specs/hardware

That is the one I really was referring to above, and it goes for € 269 here currently. The TR-004 goes for € 251 over here. BTW, store prices, with stores that have shipping facilities. Amazone may be cheaper, no idea.
There also is a black version with more functionality (includes a 10 GBe port, f.e., and can be extended with more DRAM if necessary) , the TS-431KX, but that is going for € 351 currently.
There are actually quite a few models in the 431 series, all offering slightly different functionality. All in the same format, except for the rack-version, which also happens to be the most expensive version by far.

I guess it is a matter of budget vs required functionality in the end.

HTH, warm regards, Wim