To Make a Backup Copy of the Open DGN File
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From the Utilities menu, choose Key-in.
The Key-in window opens.
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In the window's key-in field, key in BACKUP [file_specification].
File_specification is the directory in which you want to save the backup copy. If file_specification is omitted, a copy of the open overlay DGN file with the extension ".bak" is saved to the directory specified by MS_BACKUP.
The open overlay DGN file is not closed.