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| хранение дополнительных копий для сохранения доступа к данным (Availability and durability are two very different aspects of data accessibility. <...> Historically, availability has been achieved through hardware redundancy so that if any component fails, access to data will prevail. Durability refers to long-term data protection , <...> it is concerned with data redundancy so that data is never lost or compromised Wakeful dormouse) | |||