While I can’t help you find free downloads of Super Mario Odyssey (as that involves copyrighted material), I can definitely give you the lowdown on the different file types and the latest updates if you're managing your own backups! NSP vs. XCI: What’s the Difference?
If you're looking to update your Super Mario Odyssey game, you can do so by:
Purchase the digital version directly from your console. This ensures you receive all official updates and DLC automatically. Physical Media:
Super Mario Odyssey received widespread critical acclaim for its creative gameplay, charming graphics, and the way it revitalized the 3D platformer genre. It has won numerous awards and is considered one of the best games of all time.
XCI files, on the other hand, are used for cartridge-based games and contain the game's data in a format that's similar to NSP files. XCI files are used to extract and backup game data from cartridges, and they can also be used to install games on a Nintendo Switch using a compatible installer.
Official updates for Super Mario Odyssey are free and should only be obtained through official Nintendo channels to ensure safety and legality.
Nintendo provides free software updates for Super Mario Odyssey to fix bugs and add new content, such as Luigi’s Balloon World and VR compatibility. How to Update Super Mario Odyssey | Nintendo Switch