The U.S. National Archives on Wednesday said it is offering a $50,000 reward for information leading to the recovery of a missing hard drive that contains personal information of former Clinton administration staff and visitors. The small portable hard drive was being kept as a backup, the National Archives explained in a question-and-answer document (PDF) on its Web site. It held copies of about 113 four-millimeter tape cartridges of "snapshots" of hard-drive contents of employees who left the Executive Office of the President. Because the staff maintained White House entry information and electronic address books, the external drive contains personally...