Synology has a NAS box for everyone, we’ve concluded.

They make solutions from single drive boxes that many people have in their own homes to monster rack solutions that can take dozens of drives and support a small army of employees.

A sweet spot in its range are machines that might be of interest to enthusiasts but also small and medium-sized business customers. Those are precisely the customers that Synology wishes to target with its new DS1520+, a five-bay NAS with lots of expansion options.
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https://www.techradar.com/reviews/synology-diskstation-ds1520