| 摘要 |
PURPOSE:To provide a method for preparing a backup magnetic tape for a daily work file and a method for restoring destruction or the like generated in the work file by means of the magnetic tape in a distributed system for integrating many data recording media in a recording medium. CONSTITUTION:The system is provided with a management table 20 for storing information such as status, file numbers, processing dates, and magnetic tape numbers in order to manage the working states of respective data files, and at the end of work, required contents in a working file 21 are recorded in a data file MT 23 by a backup process and then the contents of the table 20 are recorded and stored in a system file MT 24. In the case of recovering destructed data, a recovery process is started, a recovery information table is prepared from the information stored in the MT 24 and the data of a specified header in the backup MT 23 which corresponds to a number specified by the information of the prepared table are successively inputted to the file 21 to recover them. |
