"Copy" might be the incorrect word.
The controller must be in Program Mode.
Under the direction of RSLogix 5000, the controller creates a binary image of its operating system, user program, tag database, and tag values.
The controller then writes this binary image file as well as a XML file that contains the startup options, to the CF card.
Once that is done, you can copy and move and do anything else with the files that you wish using ordinary file tools.
A-B will only support the 1784-CF64 and -CF128 cards that they sell. You can try to use any FAT16-formatted CF card that you wish, but you're on your own if it does not work.