144/8/16-CH DVR Quick Start Guide8. Back upThis unit supports backup by USB flash,DVD writer and USB HDD.Connect an external USB device to one of the USB ports to back uprecordings from the DVR’s internal hard disk.Step1:Enter into Menu -> Storage -> Backup tab.Step2: Click “Detect” to identify the external USB device and displays thedevice information.Step3: Click`` Backup” to enter the Backup interface as shown below.Set the start & end time, select channels and click “Add” button toDisplay the searched data in the data backup list box.Step4: Select a required file or checkmark “All” to select all data files. ClickBack up button to pop up Backup information window.Step5: In the backup information interface, user can select save file type``AVI”, Then click Start button to start backup.