Public cloud is a model of cloud computing based on an architecture where scalable and elastic IT-enabled capabilities are provided as a service to external customers using Internet technologies. Some of the public cloud services are free and others are offered on a pay-per-usage model. In comparison to private cloud, it provides services to multiple clients using the same shared infrastructure. Examples of public clouds include Macquarie Government, Amazon Web Services, Microsoft Azure, and Google Cloud.
Storage is typically redundant, using multiple data centres and careful replication of file versions. This characteristic has given it a reputation for resiliency.