Double Image-O works with Windows native file system formats that can be accessed with Windows Explorer or other file management software without using any proprietary data sets.Double Image-O advanced version has additional and powerful features:Takes point-in-time 'snapshot' backups of multiple drives, folders and files while running Windows.Copies dynamic disk and Open Files that are in use such as Microsoft Outlook (*.pst) files, *.DLL, etc. that are not ordinarily copied by other backup software programs when such files are in use or active.The built-in Double Image-O 'throttle' allows backup sessions to occur at any time of the day so users may continue working without interruption.Here are some key features of "Double Image-O":