You can have redundancy and horizontal scaling with private servers and still end up paying less than what you would on AWS and the like. I have some clients w

You can have redundancy and horizontal scaling with private servers and still end up paying less than what you would on AWS and the like. I have some clients who use AWS and others who prefer colo and/or dedicated servers from traditional datacenters. The latter group can afford to over-provision everything by 3-4x, even across different DC's if necessary. DC's aren't yesterday's dinosaurs anymore. The large ones have a bunch of hardware on standby that you can order at 3 a.m. and start running deployment scripts in minutes.