Following a hybrid cloud model helps firms to derive the benefits of private & public clouds and overcome the disadvantages as well. The hybrid model provides the IT managers the opportunity to decide what stays within the private cloud and what could well be derived from the public cloud. Public clouds help make cloud computing more accessible to enterprises by addressing their concerns within the cloud domain at the same time providing them with the benefits of the cloud infrastructure which legacy IT infrastructure systems cannot provide.

Some of the goals that are accomplished by hybrid model include:

Importance of Public Cloud: Hybrid model provides firms of varying sizes to hold resources both on premise as well as on the public cloud as and when needed. Storage and compute services which form an integral part of the IT infrastructure could well be shared on private and public clouds as needed. For example, companies like Zynga who’ve launched Farmville maintain a hybrid cloud model since they are not aware whether a particular game they have launched might go viral at any time. If this happens, then they can always use the extra resources available on the public cloud whenever any spikes or sudden increase in usage levels happen.

Security Assurance: Hybrid models address the security issues IT managers might have with deploying all their systems on a public cloud beyond the secured firewall of the enterprise IT. It validates the fact that not all IT resources should be placed on the hybrid cloud. Keeping in mind requirements of security, performance and compliance issues certain parts or systems of the IT infrastructure need to be part of the local (private) environment. This can be achieved by placing the data on the most secure platforms and then provisioning the processing power between private or local as and how required.

Intelligent Architecture: Hybrid cloud model obviously provides an intelligent architecture where the resources can be deployed across private cloud, which is essentially a sunk cost and also tough to maintain and the public cloud which is flexible and easily scalable.