This tip has now been beta tested, and it is working like a charm, thanks to Bert!
I told Bert that I would write a new, comprehensive step-by-step list, to help people successfully utilize this very handy tip.

Open Notepad. Copy and paste the following text into Notepad:
xcopy "C:\Program Files\Amazing Charts\*.enc" "H:\AC Backups" /D /V /G /H /R /K /Y
Change "H" to whichever drive you want to copy your encrypted files to.

Save the text file to your desktop as a "batch file". Just hit "save", and call the file CRYPTO.bat, or FLASHBACKUP.bat (or WHATEVER.bat). If you do this step properly, an icon is created with a little gear in the middle.
If you double-click on this icon, any ".enc" (encrypted) file in the Amazing Charts folder will be copied onto your flash drive (or other drive of your choosing).
If you click on the icon and nothing is saved to the flash drive, you may not have a ".enc" file in the Amazing Charts folder! Just look in the folder.
TROUBLESHOOTING:
If you don't see an ".enc" file in the Amazing Charts folder, your Off-Site Backup may be saving the encrypted file to the wrong location. This is no problem. There is a little check-box in the main Off-Site Backup dialog box which says:
"Can't browse to the correct .enc file? Check this box to save the file in your Amazing Charts folder."
Check that box before you click "Upload," and your encrypted files will be saved in the Amazing Charts folder, where the batch file you have created can find them and copy them to your flash drive.