Hello, @DYuQeYMCVK0L
Here is the some key points which will help you.
Games installed via the Itch.io app typically store their saves in a directory within the app's data folder. This location can vary depending on the operating system:
Windows: The saves are often stored in a directory within the %APPDATA%\itch\apps folder.
macOS: Saves may be located in a directory within the ~/Library/Application Support/itch/apps folder.
Linux: Saves can be found in a directory within the ~/.config/itch/apps folder.
You can check the specific location by navigating to the game's installation directory within the Itch.io app and examining the file structure. Once you identify the location, you can configure your Game Save Manager to back up saves from that directory.
I hope this info will help you.
Best Regard,
geraldine198