Hi,
I have not tried Senran Kagura Deep Crimson, Yokai Watch or Yo Kai Watch, but I have tried with 10 games, and only 3 of them the conversion has worked, and in 7 of them it does not work. Since I use "save2 backup" in all cases, I suppose it is a bug. 8 of them were EU version, and 2 of them spanish version. I wrote an email to sky3ds team with the list of games and they told me they would take a look.
So, maybe the "save2 backup" only works for some games, and does not work for others.
Only FYI, the games that "save2 backup" work for me are: 0005 - Super Mario 3D Land (EU), 0207 - New Super Mario Bros. 2 (EU), 0241 - Donkey Kong Country Returns 3D (EU)
The ones that it doesn't work: 0117 - Need for Speed - The Run (EU), 0188 - Pac-Man & Galaga Dimensions (EU), 0197 - 50 Classic Games (EU), 0281 - Pinball Hall of Fame 3D - The Williams Collection (EU), 0336 - Profesor Layton y la Mascara de los Prodigios, El (ES), 0749 - Profesor Layton y el Legado de los Ashalanti, El (ES), 1107 - Tetris_Ultimate_EUR_3DS-VENOM, 1198 - Cooking Mama - Bon Appetit EU, 1199 - Gardening Mama - Forest Friends EU