You'll need special and not so cheap hardware like Multi Game Doctor, Super Backup Card/GX/GBX,Game Boy Xchanger, GBDoctor, etc unless you know how to make a homebrew dumper, which it's not easy as good electronics knowledge and skill is required.
The easiest way, as you might know, would be to download your game, since you own an original cart it would be legal. Then all you need is a good GB/GBC emulator as BGB, Visual Boy Advance, or TGB, for example.
More info about backup units below:
http://www.robwebb.clara.co.uk/backup/
http://ucon64.sourceforge.net/
http://ucon64.sourceforge.net/ucon64/hardware.html


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