This guide will let you know how to back up / Restore the Game Saves on The Switch (CFW).
JKSV
1- First, click on the following link https://github.com/J-D-K/JKSV/releases and it will take you to the official GitHub site from where you have to download the JKSV.nro.
2- Once you reach this site, come under the Assets and click on the nro file.
3- Once the download completes, you need to drop the file into the switch folder on your sd card.
Switch Settings
First, open the switch and then load up your Homebrew menu. Open the JKSV app, create a backup save and name it a test or you can name it whatever you want.
Then click on test one and press Y to restart it. To restore the original backup, go down to my original save and restore that. After that, again restart the JKSV and launch the game.
Now go into the Home screen of the game and select the save slots option. A new save slot for your game will be created.
To find the restore files, go back to your PC, then go into the switch folder and open the JKSV folder. All your backups will be here and you just need to drag and drop where you would like to place them.
