ODROID-HC4 with OLED. I've known O-Droid as an alternative to Raspberry Pi but this is interesting as a NAS device. It's an SBC (Single Board Computer) with two SATA ports built in so you can just plug two hard drives in and get running quickly. I've got my Pi4 system running well with external USB-3 drives but this is something I'm going to keep in mind if anything happens to that...