the game once and create a character to ensure the proper folders are generated.
How to Find, Back Up, and Transfer Your Stardew Valley Save Data on PC
This is precisely why the official troubleshooting guide recommends a specific workaround if cloud sync replaces your save incorrectly: launch the game but do not load any save, and while the game is still running, delete your save folder and replace it with your manual backup. Running this operation with the game already launched prevents Steam from interfering during the replacement process.
The backup from the previous in-game day.
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