Document management systems and file management method

Question: providing a document management system and file management method which can effectively perform the backup process using the virtual file system metadata configuration database from the backup process by the same side. Solution: said file management system includes: the virtual drive controller (110) that controls a virtual drive (5); metadata database (210), which contains the physical file for the virtual device in the storage (6) information file associated; backup controller (120), the backup process its file management; and backup status management database (220) for use in the management of the backup process. The virtual drive controller (110) the updated information is registered in the file management database backup state (220). The backup controller (120) referring to the backup status management database (220) and the metadata database (210), and the backup file.