There is a common statement that the user should not be concerned with what is the architecture of the cloud. The devil is in the details, but even an old saying applies to a new technology like cloud computing. In cloud storage, you are looking for that delicate balance between cost effectiveness and reliability. The provider has a role to play in this availability as well, and its capabilities and track record has to be understood. George Crump: “I would scrutinize very closely those providers that do not share the details of their architecture””]
Source: https://www.darkreading.com/database-security/in-the-cloud-architectures-matter