National Technical University of Ukraine
Data crashes can cause unpredictable and even hard-out effects for an enterprise or authority. Backup strategies as antidote unify a complex of organizational and technical measures that are necessary for data restoring, processing and transfer as well as for data security and defense against its loss, crash and tampering. High-performance modern Internet allows delivery of back-up functions and is complemented by attractive (mobile) services with a Quality of Service (QoS) comparable to those in Local Area Networks (LANs). One of the most efficient backup strategies acts the delegation of this functionality to an external provider, an online or cloud storage system.