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How to backup Infocom's Zork III. by Independent (IND)

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How to backup Infocom's ZORK III game:

*Insert DOS disk in drive A

A>DISKCOPY A: B:          <-- Ignore the errors on tracks 1-3!
*Place your ZORK I or ZORK II disk in drive A and a blank disk in drive B.
 BE SURE THAT YOUR ORIGINAL IS WRITE-PROTECTED!!!

A>
*Now take out your ZORK disk and insert your DOS disk in A.

A>DEBUG
-R CS
xxxx
:0000		<-- you enter this
-R DS
xxxx
:0040
-R IP
xxxx
:7C00
-R ES
xxxx
:0000
-L 0:7C00 0 0 8
-G =0:7C00 0:7C32
-G 0:7C44		<-- Don't take a shortcut here!
-R ES
xxxx
:04C5
-G 0:7C46
-E 7C0:007C 02 08
-W 800:0000 1 8 8
-E 07C0:007C 03 04
-G 0:7C44
-R BX
xxxx
:0000
-G 0:7C46
-E 07C0:007C 02 08
-W 04C5:0000 1 10 8
-E 07C0:007C 03 04
-G 0:7C44
-R BX
xxxx
:0000
-E 07C0:007C 02 08
-W 04C5:0000 1 18 8
-E 0:7C41 B8 08 02
-W 0:7C00 1 0 8
-Q

*This patch was done under DOS 1.1 - I haven't tried it under DOS 2.0 yet -
 which may cause unpredictable results...
*Take out your new disk in drive B and write-protect it.
 It is now DISKCOPY-able.
*Reboot your system - press ALT-CTRL-DEL.