You can't because corporate data rules. Personal data needs to be kept off the high-priced storage arrays in your data center. Now, I know that's a little draconian. Establish criteria for grading application data and then prioritize the applications against the criteria that is agreed upon by IT and business managers. Storage security is the elephant in the room and it needs to be addressed as part of the criteria that weighs the value of the data. Performance and accessibility also fall under this as well. In the long run you need to understand what is already stored and how that space can be more efficiently used going forward.
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This was first published in January 2003