Once upon a time, the organizations had plenty of time and capacity or face it that the needs were limited. Backups could be done at night when the systems were not loaded or were shut down. But since then, the needs have crossed the roof, systems work around the clock and so do the users, and there's no period when you can shut everything down for backup. Today, an organization needs to store all kinds of data. There are different time periods for which you want to store this data based on its utility to the organization and regulatory needs. And then you have storage devices lying around that've been exhausted or are soon going to be all filled up.
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