Epson Apex 20020 - Manual (Page 105)

5. Remove the original diskette from drive A and insert the
blank diskette (the target) in the drive. Press any key. If the
new diskette is not formatted, DISKCOPY formats it and
then copies the contents of memory to the diskette. When
the copy is complete, you see this message:
Copy another diskette (Y/N)?
6. Press Y and Enter to copy another diskette or N and Enter
to return to the MS-DOS command prompt.
Using the BACKUP Command
Use the BACKUP command to back up the data on your hard
disk. It provides a convenient and efficient way to copy the
files on your hard disk. BACKUP allows you to do the
following:
Split large files across two or more diskettes
Copy only those files that have been modified since the
most recent backup
Copy only those files that have been created (or modified)
after a specified date
Copy files in the current directory together with files in all
subdirectories of the current directory
Format diskettes while copying files.
Unlike DISKCOPY and COPY, which make readable copies of
files, BACKUP creates files that you cannot access directly. To
return files copied with the BACKUP command to their
original locations on the hard disk, you must use the
RESTORE command.
Using MS-DOS With Your Computer 4-33