If you want a small NAS in a similar form factor I'd recommend Helios64 5-bay NAS https://kobol.io/. It is an Arm64 board runs mainline Armbian. Also comes with 2.5Gbit networking and a built in UPS battery.
I don't understand why people who care about security and have linux knowledge would use Synology/QNAP. They are both proprietary, often exposed to the internet, and packed full of so many features that they are consistently full of vulnerabilities (SynoLocker/QLocker etc).
I don't understand why people who care about security and have linux knowledge would use Synology/QNAP. They are both proprietary, often exposed to the internet, and packed full of so many features that they are consistently full of vulnerabilities (SynoLocker/QLocker etc).