Synology RackStation RS820+ 4 Bay NAS Server with redundant power supplies. Also installed on this personal device is an E10M20-T1 expansion card that provides a 10GB ethernet port and (2) M.2 NVMe SSD slots that each have a Synology SNV3400 400GB Enterprise Grade SSD installed. This is a personal unit that replaced a desktop NAS that was lost to a nearby lightning strike. It was itself replaced by an 8 bay device 2 years ago, and has been racked and powered down since then. Actual time in service was approximately 3 years on a home network; I am the original owner.
I also have (4) 12TB Seagate Ironwolf Pro Hard Drives available that were installed in this unit and are under warranty until 11/17/26. They are available for $700 for all four; new ones list for $500 each. Please message me if you are interested in them, as they are not included in the sale of the NAS.