The Asustor Nimbustor 2 (AS5202T) comes with dual 2.5GbE out of the box

Asustor fitted the Nimbustor 2 with two 2.5 Gigabit Ethernet ports (RJ-45), giving you link-aggregation headroom in a compact two-bay chassis. Even without aggregation, dual ports let you segregate storage traffic from management or backup traffic, which is a nice touch for a unit this size.