Leaked from ReSwitched Discord Server, but it does work on your older (cart1)-type games on your exploitable Switch!
The piracy scene is on fire again (with a ton of usual scene drama on top to fuel the flames), after someone 'leaked' an 'Cartridge Dumper', but as @AnalogMan points out below, it does have some limits, like no support for newer (cart2)-type games, but the version attached is now updated with features to dump to FAT32 and to dump only your 'private certs', so check it out:
As NOTED ABOVE, these dumps you make from your original game cartridges are complete including your 'private certs' which is great if you want LESS RISK by going online with your piracy backups, instead of using a NULLed warez release from BigBlueBox, but if you want to be nice and share your 'backup' online with (cough) friends, become a true pirate, with wooden leg and eye patch, you need to use a program like our own MaxConsole XCI Exploder which has options to extract/inject certs., trim/split XCIs.
NEWS SOURCE: XCI Dumper (via) GBATemp
(Our thanks to HackInformer for their nice screenshot featured above which we stole from them!)