https://www.polygon.com/2018/5/9/17331950/nintendo-switch-no-free-backup-saves

Nintendo Switch owners will finally be able to upload and store their save game data to the cloud this September, when the console’s online service launches. After an 18-month wait, owners will be relieved to have a way to back up their save games ... for the low-cost of $20 a year, and only as long as keep paying that premium.

Because unlike any other console maker out there, Nintendo offers no free method of backing up your Switch data. Unlike Nintendo 3DS, Wii U and Wii before it, the Switch currently locks all of your save games to its own hardware’s memory, with no option to move it to another location.