So much this. I'd github can afford the amount of downtime they do, it's likely that your business can afford 15 minutes of downtime every once in a while due

So much this. I'd github can afford the amount of downtime they do, it's likely that your business can afford 15 minutes of downtime every once in a while due to a failing server. Also, the less servers you have overall, the least common a failure will be. Backups and cold failover server are mandatory, but anything past that should be weighted on a rational cost/benefit analysis, and for most people the cost/benefit ratio just isn't enough to justify infrastructure complexity.