Perhaps yearly, companies spend some time removing data that they will not use again. They cannot discard certain kinds of data for legal reasons. For example, a company has to keep its yearly financial records for seven years after that financial year. Companies want to remove old data from their computers because it takes up hard disk space and also means that e.g. database files are bigger than they need to be; big files take longer to search than small files. Removing data from a system by compressing it then transferring it to e.g a tape device or DVD is known as ...
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