You’d be surprised. Most people never even test number 2. If your a novel or niche product, you can afford a “lot” of downtime For number 3, it really all dep

You’d be surprised. Most people never even test number 2. If your a novel or niche product, you can afford a “lot” of downtime For number 3, it really all depend on your load. I’ve run most early stage startups on an incredibly simple setup with a proxy placed in front of an app server. Occasionally, our monitoring will start reporting high p99’s so we go in and bump the servers to the next tier or scale horizontally just a bit more. Eventually, that breaks down but many startups will be well into Series A or Series B point. At that point, you know your customer’s needs and can hire dedicated engineers to solve reliability and uptime.