Copy the lines between the two lines with equal signs into a file named MnyBak.bat. Use Notepad or equivalent. You could put that file onto your desktop, and invoke the batchfile by double-clicking the file. You can name the file whatever you want, but it should end with ".bat".
We could get fancier. One thing would be to copy the files to a USB flash drive only if it is plugged in. Lots of things you can do. So while this file is intended to be useful, it can serve as an example for other things.
Note that starting a line with "rem " is one of the ways to add a comment (remark).
You must adjust the two "set" lines if they don't match your situation. Feel free to ask what any line does, and feel free to ask for how to do something else.
============================Begin MnyBak.bat===============================
rem simple multi-backup batch file for Money 2005 users.
rem Modify the set lines to match what you do. The %HOMEPATH% is a built-in
rem that represents the home directory/folder of the current user.
rem The batch file can be invoked from a command line, but you could alternativly
rem put the batch file on your desktop, and double-click on the file.
rem That is probaly easier for most.
set BackupFolder= %HOMEPATH%\documents\
rem If backup file name has spaces, the double quotes are needed.
set NewMnyMBF= %HOMEPATH%\documents\"mymoney Backup.mbf"
del %HOMEPATH%\documents\back8.mbf
ren %HOMEPATH%\documents\back7.mbf %HOMEPATH%\documents\back8.mbf
ren %HOMEPATH%\documents\back6.mbf %HOMEPATH%\documents\back7.mbf
ren %HOMEPATH%\documents\back5.mbf %HOMEPATH%\documents\back6.mbf
ren %HOMEPATH%\documents\back4.mbf %HOMEPATH%\documents\back5.mbf
ren %HOMEPATH%\documents\back3.mbf %HOMEPATH%\documents\back4.mbf
ren %HOMEPATH%\documents\back2.mbf %HOMEPATH%\documents\back3.mbf
ren %HOMEPATH%\documents\back1.mbf %HOMEPATH%\documents\back2.mbf
ren %NewMnyMBF% %HOMEPATH%\documents\back1.mbf
==============End MnyBak.bat==================================