I don't need 24/7 up time - but I just prefer it - I am too lazy to tinker right now and just need stuff working.You need homeprod, homeintegration, and hometest
Nah kidding, if you want 24/7 uptime then redundancy is key. If best effort is fine, then single box (and maybe a few spare parts or replacement box) suffices
The problem is my dns/dhcp/nas etc is running on this cluster - so its almost my entire network that goes down (not true - but thats the perception when you cannot get an ip or resolve addresses) - so I should probably just make a "tiny" cluster to run my important services and have a "lab" for the rest that can be best effort.