Backing up data from Outlook is simple and should become part of your regular data backup routine. To export contacts (or any other data, including calendar, tasks, and regular mail), select File, Import And Export. Choose Export To A File and then Personal Folder File (.PST) from the menu. In the next menu, select the sub-folder you’d like to export, or choose the Personal Folders selection to export everything (and make sure you click the Include Subfolders check box).