O&O AutoBackup automatically backs up your files and synchronizes them completely, immediately backing up your photos and videos to an external HDD or USB! O&O AutoBackup copies the original files and synchronizes any future changes made to them. The backup process is 100% automatic, and whenever a portable device (such as an external HDD or USB drive) is connected to a computer, the backup process starts like plug and play. Copy the files in a 1:1 ratio and place them on the target disk drive.