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This article presents an analysis of cloud technologies as key current trend in the development of IT infrastructure, their main characteristics, security levels and the increased requirements they must meet when considered for defence and security applications. It provides an overview of main standards and requirements that modern data centres have to meet to ensure a high level of availability of the provided IT services. Specific requirements have been formulated for building a sustainable system of modern data centres for defence and security needs, and attention has been paid to data protection when using cloud technologies. A solution is proposed for implementing cloud technologies and an approach for building an integrated data centre system for defence and security needs in organizing collaborative work between officials within the organization.