Using The Backup Command - Epson Apex User Manual

To copy all the files on the diskette in drive A to the diskette in
drive B, type:
COPY A:*.* B:
To copy all the files on drive A whose names begin with the
four letters "MEMO" and end with any single character to drive
B, type:
COPY A:MEMO? B:
Another task you can perform with the COPY command is
combine a number of files into one file. Use this format:
COPY REPORT + FACTS + MEMO DATA
When you use the COPY command this way it copies the file
REPORT, then FACTS, and then MEMO into the new file,
DATA. In this example, the files are located on the current
drive.

Using the BACKUP command

You typically use the BACKUP command to back up hard disk
files. It lets you store files in a compressed format for archive
purposes. You can use BACKUP to copy files from any disk to
another (hard disk to diskette, diskette to hard disk, diskette to
diskette, even hard disk to hard disk).
Unlike DISKCOPY and COPY which make exact duplicates of
files, BACKUP creates files that you cannot use until you
restore them using the RESTORE command.
You can use switches with BACKUP to back up files created
after a certain date, or to specify files stored in a certain
directory.
Using MS-DOS with Your Apex 3-21