An off the shelf NAS might be better. Some of them allow installing your own operating system such as TrueNAS. These boxes come with the right form factors, CPU

An off the shelf NAS might be better. Some of them allow installing your own operating system such as TrueNAS. These boxes come with the right form factors, CPU, RAM, number of NICs, power consumption, etc. Solutions such synology provide web interface, phone apps, and applications for syncing, photo management and backup. The units come with software for domain name, SSL certificates, monitoring, drive management, WoL, etc. There is a lot of software functionality useful for NAS built in.