You only need a pool of servers behind a load balancer for extreme reliability or for scaling out. Most small to medium web applications can handle: - Only be

You only need a pool of servers behind a load balancer for extreme reliability or for scaling out. Most small to medium web applications can handle: - Only being reliable for 99.99% of the time (using a single cloud VM where the cloud provides the hardware level failover). - Scaling up instead of out (adding CPU, RAM and faster disk).