The efficiencies, productivity, agility, elasticity, and cost savings all make a compelling case for migrating from traditional private networks and data centers to private clouds and other virtualized instances. CISOs said their greatest concern around a cloud migration is maintaining control of their companies data and computing resources. Many countries have strict data sovereignty requirements that do not allow for some types of data to be moved off-premises or to be stored in cloud environments that span geographical or political regions. A CASB is a security policy enforcement point placed between cloud users and cloud providers that is used to enforce enterprise security policies.”]
Source: https://www.fortinet.com/blog/industry-trends/moving-to-the-cloud-top-security-factors-to-consider