a server:

• openbsd
• 1024 mb of memory
• 10 gb of disk
• 1 vcpu

b zerver:

• freebsd
• 1024 mb of memory
• 20 gb of disk
• 1 vcpu

c homeserver:

• alpine linux
• 4096 mb of memory
• 64 gb of emmc
• 4 cpu