The Aluratek AHDDUB300F External SATA Hard Drive Dual Duplicator is the perfect solution to duplicate the exact content currently stored on your computer's SATA hard drive. All of your OS (operating system) and program files are 'duplicated' in addition to your data files, making this a truly complete backup solution that's bootable. With its easy-to-use form factor, all you need to do is insert your current 2.5" or 3.5" SATA hard drive to one side of the duplicator dock, then insert your new backup SATA drive into the other side of the duplicator dock and press the start button. Your computer will start up with all of your program files, operating system files, Outlook contacts, personal settings and more. There is no need to connect to your computer. The LED indicator light will show the status of the duplication process.