This technical guide focuses on the characteristics of true cloud security systems, differentiating them from traditional client-server software that is often misrepresented as cloud-based. It outlines the essential features of cloud computing as defined by the U.S. National Institute of Standards and Technology (NIST) and the ISO/IEC 17788 standard. The paper explains how these characteristics apply specifically to cloud-based video management systems (Cloud VMS). It emphasizes the importance of understanding cloud computing to identify true cloud systems effectively. The guide presents key questions to determine whether a system qualifies as a true cloud offering, including its architecture, service model support, cybersecurity profile, and vendor practices. Furthermore, it discusses the differences between client-server and cloud-native applications, highlighting the scalability and flexibility of true cloud systems. The document serves as a resource for security system end users, integrators, and consultants to navigate the evolving landscape of cloud security applications.