Adding NAS Functionality to Raspberry Pi

Geekworm X863 M.2 NGFF SATA SSD Storage NAS Kit for Raspberry Pi 4 Mod

how to build a Raspberry Pi NAS (it's AWESOME!!)

Building a 2.5 Gbps 5-drive Pi NAS - Hardware Setup

GeeekPi Raspberry Pi Mini Tower NAS Kit with Ice Tower 0.96 Display Screen for Raspberry Pi

Radxa Taco - A Raspberry Pi CM4 carrier board made for NAS with 5x SATA ports - CNX Software

SunFounder NAS Kit for Raspberry Pi with Dual Fan

Raspberry Pi Expansion Board

PI4B Mini Tower NAS Acce - Waveshare Wiki

NAS Bracket for Raspberry Pi and 2.5 SSDs

TerraPi Raspberry Pi SSD Case / RPi NAS Server Case with USB3 to SATA support