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The operating systems (DOS, Win95/98, WinNT/2000/XP) maintain a type of meta data known as archive bits associated with every file and directories. In earlier MS-DOS and Microsoft Windows, there were four attributes: archive, hidden, read-only and system. Windows has added a new ones.The operating systems ([[MS-DOS]], Win95/98, WinNT/2000/XP) maintain a type of meta data known as archive bits associated with every file and directories. In earlier MS-DOS and Microsoft Windows, there were four attributes: archive, hidden, read-only and system. Windows has added a new ones.This bit is used by programs that modify files. One example of software making use of this bit is for file backup. It was common practice for backup software to use the archive bit for keeping track of files that have changed. In this way the software allows incremental backups based on the status of the archive bit. When the backup software archives or backs up the file, it resets the archive bit (cleared). Any software that subsequently makes a change to the file shall set the archive bit (set). Thus when the backup software runs the next time, it will be able to identify the modified files by considering the state of the archive bit. If the bit is set, it will replace the backed up version with the newly modified version. If the bit is still cleared, then the backup software will skip the file assuming that it is the same as what is on the backup archive.* Backup software will "clear" the archive bit (remote it from attrib output)* Software changing the file will "set" the archive bit (adding the A to attrib output)Poorly written software may modify the files without setting the archive attribute. If the backup software uses incremental backups to backup these files, it will rely on the software to set the bit appropriately. [[Category:Computer Technology]][[Category:Microsoft]][[Category:Windows]][[Category:DOS]][[Category:MSDOS]]