Any one of several data reduction systems that looks at data inside a specific file and reduces the bits required to represent the data. Some data compression, called "lossy", eliminates non-essential data and reduces the information stored (jpeg files, for example). Other techniques, called "lossless", often used in data backup replace repeated strings of data with reference tables (any of the Lempel-Ziv compression systems, such as Zip).
Variable-length deduplication typically reduces disk backup capacity by more than 90% and allows existing networks to be used for automated DR protection.
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In the digital age, maximizing asset value often means using different storage tiers with different cost and access characteristics for data in different stages of its life.
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