consultation for Larage Project

I would like to build a system (for example a school management system). The important thing is what I want is for the system to be on the cloud and on more than one server so that there is a Raid or any other alternative technology, between the servers and a backup every hour between the servers so that the first is the main and other backup servers (meaning running networks and the cloud). The most important thing is that I want the system to be online and available to everyone so that the owner of the company enters, for example, registers and creates his own copy of the system, meaning the school owner gets a copy of the system, but in the cloud and the system automatically creates and prepares his application according to the data given by the customer . And there will be a special link (separate domain) for each client. What are the practices, techniques, packages, or advice that can be useful to me in the project?