Switch: How to transfer saved game data to a new Switch

How to transfer games and saved game data to a new Nintendo Switch

[Txmicd]

I hope when you transfer data, it saves data from cartridges too, like Pokémon.

[Maze]

Do you have to keep transfering manually or is it possible automatically

[fatimavillarreal]

I have a question, so I got an oled and I was exploring the transfer data options and I transferred my splatoon 2 date over to the new one but when I entered the game in the old one it was reseted😭 Right now the s2 game is still downloading on the new one but if the data is not there is there anyway to undo it or recover it🥲