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An excellent NAS, easy to install, fast, quiet and scalable.
I just bought a m2 ssd to add a cache on it anyway (not for slowness issues, but rather for the use I do with it, photo storage for several users and web server plus storage server for sites already in place).
Don't forget before buying that the ideal is to connect it to a port of your internet box, not to a switch which is on a port of the box, the bandwidth will be shared and you will lose in remote use (outside local network).
The QNAP maarket is very well equipped, there are many applications