Users in the U.K. whose data were destroyed by the fire received phone calls and visits, said Ken Rubin, senior vice president of marketing for Iron Mountain. Iron Mountain customers in the U.K. not affected by the fire received letters from the company, he said. Iron Mountain also called users affected by the fire in the Ottawa facility.

"We are not publicizing this to customers around the world who were unaffected," he said. "Over time, as we get some distance and more information is available, we'll begin broadening the communications."