Hybrid cloud promises the best of both worlds by combining public cloud provisioning with private cloud or dedicated hosting resources. This enables you to manage a staged transition to the cloud (moving less mission-critical applications over first to test the concept, or simply scaling up cloud resources as legacy equipment is retired for optimum cost savings).
It gives you the option of maintaining a mixed pool of resources (hosting mission critical applications and highly regulated data internally and shifting non-sensitive operations to the cloud) or, ideally, across clouds.
Hybrid cloud promises the greatest cost savings and resilience when resources can be deployed across clouds flexibly and elastically. To achieve this, your cloud provider(s) will need to deliver real interoperability and non-proprietary management tools.