There are several products that let you read both the game files (the ROM) off a cartridge, as well as reading and writing the saves. ## GB Operator https://www.epilogue.co/product/gb-operator The Operator has slick hardware and software and is likely the most user-friendly option. You download the companion app, and just plug this into your machine and insert your cartridges. It supports backing up ROMs and saves, loading saves, and loading homebrew games if you're using a rewritable cartridge. ## FunnyPlaying BurnMaster https://funnyplaying.com/products/portable-cart-flasher-burnmaster This is a portable handheld dumper/writer. You buy it from FunnyPlaying as a kit, and need to build it and flash the OS onto an SD card. Once completed, you can dump existing cards onto the internal memory and walk around with a whole library of games ready to flash onto a waiting cartridge. It's a bit less friendly than the rest, but that it looks like the bottom half of a GBC and is entirely self-contained is extremely cool. ## BennVenn Joey Jr https://bennvenn.myshopify.com/products/usb-gb-c-cart-dumper-the-joey-jr I don't have first-hand experience with a Joey Jr, but I want one!