In recent years, the desire to have a large amount of storage capacity combined with well-organized scalability created a pushing and engaging driving force behind the migration of various enterprises, organizations, and small businesses from standalone execution to different types of Cloud like private, public and hybrid along with Fog, edge, and containers. The Wireless based sensor network and their data storage Security in different types of Cloud, Computing systems are the primary focus of this work, with users' privacy being protected from attackers as a secondary objective. As sensor networks are now coming to a new era of virtual sensor networks (VSN) with Cloud services getting added to Sensor networks, the online database is growing exponentially. With the emergence of Sensor as a Service (SaS) in cloud applications the focus of each storage and computing model is on protecting sensor-based data belonging to users and their privacy from thwarting cyber-attacks. It is also critical to ensure data integrity for cloud-based storage which has to be maintained. This research article provides takes a systematic approach to review comparative analysis provided by various authors and the security threat at different layers of open system interconnections for service providing and privacy aspects on hybrid Cloud storages and service applications in Sensor as a Service for Virtual Sensor Networks based on Wireless sensor networks.