Can you explain the security requirements we must adhere to in order to confirm that our customers' data is secure in the cloud?

"There are a total of four security requirements that are generally implemented in order to be compliant with user privacy laws. These are:
- Validation of input; The input data must be controlled and transmitted securely
-Backup and Security; The data is stored and secured and not open to access from unauthorized parties
- Output reconciliation; Audits must be performed that the data output is the same as the data input
- Processing; Data used by an application is controlled throughout the process and not exposed to unauthorized users."