: The macOS Server 5.12 installation requires approximately 250MB of space, while the Monterey OS installation itself needs about 26GB . Initial Setup and Configuration
: Create a full backup or a bootable clone of your current server installation, including the Open Directory if applicable. macOS Server 5.12
Many features originally found in macOS Server are now native to macOS Monterey and do not require the Server app: MacOS Server 5 Part 1: Server Upgrade : The macOS Server 5