A six-bay NAS is easy to understand at a glance. You load it with drives, build a storage pool, install the services you need, and start throwing data at it. That’s a big part of the ZimaCube 2’s appeal, but the drive bays aren’t the part I keep coming back to. The two PCIe slots inside are much more interesting because they leave room for the ZimaCube 2 to become something quite different from the NAS you bought on day one.