Benefits of the Cloud

• Cost reduction (hardware, administration ...)
• Resource optimization (Processors, memory ...)
• Economy of scale (You only pay for what you use...)
• Flexibility and reactivity (If the needs evolve ...)
• Ease of implementation
• Quality of service
• Access from anywhere
• Backup

Public Cloud

Benefits

• Cost. Infrastructure at the charge of the service provider. The customer does not bear any IT investment.
• Fast and easy deployment (usually web portal)
• Easy credit card purchase

Disadvantages

• Random performance (pooling)
• Geographic location of servers / data
• Legal security requirements for auditing
• Random ALS
• Overall robustness dependent on the weakest link
• Complication of data backups and restores (Symantec survey showing that 68% of companies experience restore failures

Hybrid Cloud

Benefits

• Allows you to move the non-critical part of the infrastructure and data to a more financially competitive environment.
• Possibility of interfacing its infrastructure with that of a customer or supplier via this public space.

Disadvantages

• The definition of the isolation levels between the private and public clouds is essential, and to do this, the analysis of the data that should not go into the public cloud is crucial.

Cloud Unknown (Rogue)

Disadvantages

• Multiple external service subscriptions without economies of scale.
• No integration
• Lower security: more login & password
• Unauthorized transfers of sensitive data.
• Failure to comply with audit and compliance procedures.