View source for BACKUP (MS-DOS)

{{FormatInfo
|subcat=Backup
|extensions={{ext|@@@}}, others
}}
The '''BACKUP''' command in MS-DOS backed up the contents of a hard disk to files of a proprietary, undocumented format which could be returned to their original file structure using the RESTORE command. A number of different formats have been used in different versions of DOS. Files generally had extensions consisting of three digits (incremented consecutively across the files of the backup set), with a control file called ''BACKUPID.@@@''. The aim was to store the entire file and directory structure of a disk onto a set of files that each fit on a floppy disk.

The developers of FreeDOS have attempted to reverse-engineer these formats to produce backup and restore commands in that system that are compatible with Microsoft's.

== Sample files ==
* {{DexvertSamples|archive/dosBackupFile}}

== Links ==
* [http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/dos/restore/brtecdoc.htm Tech docs from FreeDOS]
* [http://www.computerhope.com/backup.htm Backup command help]

[[Category:Archiving]]
[[Category:Microsoft]]
[[Category:MS-DOS]]
[[Category:File formats with too many extensions]]