BACKUP (MS-DOS)

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{{FormatInfo
 
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|subcat=Backup
 
|extensions={{ext|@@@}}, others
 
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* [http://www.computerhope.com/backup.htm Backup command help]
 
* [http://www.computerhope.com/backup.htm Backup command help]
  
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[[Category:Archiving]]
 
[[Category:Microsoft]]
 
[[Category:Microsoft]]
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[[Category:MS-DOS]]
 
[[Category:File formats with too many extensions]]
 
[[Category:File formats with too many extensions]]

Latest revision as of 16:22, 29 March 2017

File Format
Name BACKUP (MS-DOS)
Ontology
Extension(s) .@@@, 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.

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