A hybrid cloud is a type of cloud deployment model that combines two or more different types of clouds, such as public, private, or community clouds, into a single integrated environment. A hybrid cloud can meet the requirements for implementing cloud services with SSO to cloud infrastructure, on-premises directory service, and RBAC for IT staff, as it can provide flexibility, scalability, and security for cloud-based and on-premises resources. A hybrid cloud can also enable seamless and secure access to cloud infrastructure using SSO with directory service federation, as well as granular and consistent control over IT staff permissions using RBAC across different cloud environments. References: CompTIA Cloud+ Certification Exam Objectives, page 8, section 1.2

Explanation
The 3-2-1 backup policy states that there should be three copies of data, stored on two different media, with one copy being off-site. The current backup solution only has one copy of data on one media (the on-site storage server). To comply with the 3-2-1 policy, the systems administrator should configure an off-site storage server for backups, which will provide another copy of data on a different media and location.
Reference: CompTIA Cloud+ Certification Exam Objectives, Domain 3.0 Maintenance, Objective 3.2 Given a scenario, implement backup, restore, disaster recovery and business continuity measures.

Per user is a common SaaS-based licensing model that charges customers based on the number of users who access the software. This model is suitable for applications that have a clear and consistent user base, such as CRM, ERP, or collaboration tools. Per user licensing allows customers to scale up or down their usage as their needs change, and only pay for what they use. Per user licensing also simplifies the billing and management of the software, as customers do not need to worry about the underlying infrastructure, hardware, or software updates. Reference: CompTIA Cloud+ CV0-003 Study Guide, Chapter 1: Cloud Concepts and Models, page 19; SaaS Licensing.