A few questions popping up here about save game data - just to point this out for those that don't know, not only is this saved to the Switch's internal memory, not only is it locked to one Switch, but it CANNOT be backed up. Not to a USB device when docked, not to a microSD card, not to the Cloud. Lost your Switch? Then you've lost your save game data. Accidentally deleted your save games? They're gone. Your Switch has developed a serious failure and the Nintendo service center can't access the save game data? Well, guess what - yes, it's gone.
And so on.
Nintendo are doing Switch owners a terrible disservice by not implementing save game backups. I've lost count of the number of reports that I've read about people losing their save games.
"But the Switch has a new Transfer system" you say. It has indeed, but that's not a backup. It takes the profile and save game data from one Switch and moves it over to another, once done the data is deleted from the source Switch. This has only a very limited application and, as mentioned, is not a backup.