I also develop a web application used by schools. I have no problems taking the system down in the middle of the night for 30 minutes. Schools are quite possi

I also develop a web application used by schools. I have no problems taking the system down in the middle of the night for 30 minutes. Schools are quite possibly the most forgiving customers. Their revenues come from the government, so if your app goes down, they are still going to make payroll.