Some Pokémon Sword and Shield players have found that autosave in the project has damaged all the games on Nintendo Switch. Luckily, the situation isn’t as bad as it sounds.
The commotion was mainly caused by a tweet where a user reported that the Pokémon Sword or Shield autosave had erased his SD card. Later, it turned out that the data had not been erased, but had been corrupted, so the games had to be re-downloaded from Nintendo eShop. This was confirmed by other users.
As far as you can tell, the problem seems to be revolving around the SD card file format in Nintendo Switch. One Pokémon player summed up all the information about the situation. He said the problem was with the exFAT file system, not specifically with Pokémon Sword and Shield. The user recommends backing up all data and reformatting the Nintendo Switch SD Card to FAT32, not exFAT.
It is likely that the new SD cards are already in exFAT format and may be affected by this problem. Users are advised that saved data is not lost – just games and, in rare cases, screenshots.