The BACKUP command copies portions of  the  directory  hierarchy  and
  their related data definitions into a backup file.

  With the BACKUP command, you can keep a backup copy of your directory
  hierarchy, complete with history lists and access control lists.  You
  specify the dictionary directories, subdictionaries, and objects  you
  want  backed  up  and  whether you want to record the backup in their
  history lists.  You can also create a log of the given names  of  the
  dictionary  directories,  subdictionaries,  and objects in the backup
  file.

  Command Syntax:

   BACKUP [qualifiers] [path-name [, path-name]]... file-specification