Companies are hanging on to more data than they need for far longer than they need it, and it’s growing more expensive to keep secure. As privacy and security breaches become an ever-more-pressing concern, a growing chorus of experts say it’s critical for companies to take stock of what data they have and pare down.

“If you don’t have a purpose for it, don’t keep it,” said Greenberg Traurig shareholder David Zetoony, who co-chairs the firm’s U.S. data privacy and security practice.