Hybrid Cloud Storage
For hybrid cloud storage, data mostly resides within the private portion of the cloud. If apps are also deployed within the private cloud, the data store may store files and data for these apps, this should be the highest-performing storage system within your entire hybrid cloud storage strategy.
It's all about time and money
The costs of local and cloud data persistence is now so inexpensive that using secondary means, even tertiary mean, of storing data as an active backup system for primary persistence, or even as an up-to-date copy of the primary storage, is the best approach. With a few exceptions.
In the hybrid cloud storage strategy, the secondary storage system exists in the public cloud. Data is replicated or moved to a public cloud storage system, my preference is as Amazon Web Services' (AWS) Simple Storage Service, to provide active backup for the primary storage system. In other cases, an enterprise might move older data to the public cloud to free up space in primary storage. AWS Glacier would be a great example.
If a secondary storage system is used to store data moved from primary storage, be sure to design your apps to look for data in both