Smart USB Backup Drive 500GB - Picture Keeper PRO External Photo Video and File Backup Device for PC and MAC Laptops and Computers Once the app is installed - Just click "Start Backup," and relax as it does the work for you! Automatically finds and saves photos, skips duplicates For Computers - Mac & PC Compatible Use on multiple computers - software knows where each backup left off. Once one Picture Keeper fills up, just plug in the second one and it continues where the other left off! Set backup reminders to keep all of your memories protected