I highly just recommending renting machines. Hetzner or OVH are low cost providers. There is very little reason to have to buy your own machine and do the co-

I highly just recommending renting machines. Hetzner or OVH are low cost providers. There is very little reason to have to buy your own machine and do the co-location thing. If you need more machines, put them in any office that has a fiber connection, like it is cheap to get a 3Gbps connection these days. Do more than one location if you need some of them online. In different cities if needed. Basically you want to avoid being in the same weather location/powergrid connection. I've done this before and it works really well to cut costs.