Bottom PC is my NAS I built. I use it daily. I originally had a Drobo 5N but had to upgrade to a bigger chassis to hold more HDDs because they were beginning to be way to expensive to buy to upgrade the capacity. So I bought a 15 bay Rosewill RSV-L4500 chassis. I originally use the rosewill chassis for GPU mining at first but I made sure I buy a chassis that I can re-use for another purpose. Right now 13 bays are in use, 12 HDDs are in a mirrored storage pool for my own use. I do have a plan on adding more capacity to the NAS by a 2nd Rosewill Chassis and that’s with using SAS Expanders and Host Controllers, this way there is only a single server but I can add chassis of HDDs to it as needed.
My Desktop Gaming PC is the Top Chassis. I bought a rack because I needed to stack the computers in this corner, not much physical space in the room.