It starts with corporate policies around data management. This is not a new idea. We've had issues around various types of data for years. Whether it's security, backup, disaster recovery or business continuity, there is a certain lack of understanding -- in some cases a total lack of understanding as to what corporate data is being stored -- and even noncorporate data that ends up on corporate storage.
Retention should employ practices, like data classification and information lifecycle management (ILM), to help identify the data on hand. Then, use that knowledge to determine the appropriate retention, archiving and deletion strategies for your industry and specific business.
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Go to the beginning of the Unstructured Data FAQ Guide.