This Recommendation describes the brief functional model@ application scenarios and requirements for cloud storage in visual surveillance (VS) systems@ based on the requirements and architectures defined by [ITU-T F.743]@ [ITU-T H.626] and [ITU-T H.626.1]. A visual surveillance service is a telecommunication service focusing on video (and audio) application technology@ which is used to remotely capture multimedia (e.g.@ audio@ video@ image@ various alarm signals)@ and present this to end users in a friendly manner (including accessibility aspects)@ based on a broadband network with ensured quality@ security and reliability. Cloud storage is a data storage model for enabling service users to have ubiquitous@ convenient and on-demand network access to a shared pool of configurable storage resources@ which can be rapidly provisioned and released with minimal management effort or service-provider interaction. In cloud storage systems@ the physical and virtual resources can be dynamically assigned and reassigned according to user demand. Cloud storage can realize scalable@ flexible and reliable data storage for large-scale visual surveillance.