https://www.cnet.com/news/nintendo-says-cheaters-are-why-some-switch-games-cant-backup-saves-online/

On Friday, Nintendo's website quietly revealed that not every Nintendo Switch game will let you backup your progress to the cloud -- meaning that even if you pay $20 a year for the Nintendo Switch Online service, you could still lose the hours you've invested in certain games if your Switch gets lost or stolen.

Today, Nintendo confirmed that's true -- but says the company expects the "vast majority" of Nintendo Switch games will support the Save Data Cloud Backup feature. And, that there's a specific reason why some games won't. Namely, cheaters.