There are 3 types of cloud solutions.
Public cloud is essential to the internet. Examples of public clouds include Amazon Elastic Compute Cloud (EC2), IBM’s Blue Cloud, Sun Cloud, Google AppEngine and Windows Azure Services Platform.
Private cloud storage is owned by a single company and housed in a data center. Private cloud storage implements storage virtualization within an organization, thus providing a centralized storage infrastructure that can only be accessed by the authorized nodes.
Hybrid cloud storage uses both local and off-site resources. Since this storage solution usually calls for an onsite machine, it can deliver local cache and memory as well as data deduplication and encryption, making it an appealing solution for some businesses.