                             BACKUP

BACKUP is an external command that is used to copy files from a hard disk to 
a backup diskette or another hard disk. The companion command for BACKUP is 
RESTORE.

BACKUP d1:[pathname][filename[.ext]] d2: [/S] [/M] [/A] [/D:date]
					 [/F] [/L] [/T:time]	[new DOS 3.3]

       \___________________________/ \_/
	         \source/	      \destination

d1:[pathname][filename[.ext]] specify the source file or files to back up.
    Wildcards may be used.

d2: is the destination drive that contains the diskette or hard disk to back 
    up to. The destination must be formatted (using the FORMAT command), or
    or the /F option must be used, or BACKUP won't work.

/S causes BACKUP to copy the specified pathname, plus its subdirectories and 
    their files to the diskette. 

/M restricts the backup to files that have been modified (had the archive flag
    set) since the last backup. 

/A appends the backup copies to the destination without destroying any files
    already there.

/D:date restricts the backup to files that have been modified on or after
    the specified date. Date formats are described in the DATE command topic.

/F will format the destination if necessary. This option is usually not
    available in versions of DOS prior to 3.3. On DOS 4.0, this option is
    assumed. When the /F option is available, diskette size can be explicitly
    specified in the format /F:size, where size is the physical capacity. See
    the NEW_TERMS DISKETTE topic for a list of possible sizes.

/L will create or add to a log file named BACKUP.LOG in the root directory of 
    the source drive, logging the files backed up. Some versions of DOS will 
    allow you to specify the filename in the format /L:[d:][pathname]filename.

/T:time restricts the backup to files that have been modified on or after
    the specified time.

Some versions of BACKUP have more options. These are the (fairly) standard 
ones.
