Where a business system runs and who is responsible for what. The articles explain what the cloud is and how IaaS, PaaS and SaaS differ, when your own server beats the cloud, what to check in an SLA with a provider, and how responsibility for data security is shared. There is also a worked calculation of self-hosting an application on your own server, with what breaks along the way. For businesses choosing how to run a system or negotiating a contract with a provider. Start with cloud computing — IaaS, PaaS and SaaS.







