In-game, in the "Load Game" menu, there's an option to export your save files. I would make regular backups of your preferred save files, occasionally, just in case. It usually defaults to exporting the save file in the game's directory, wherever it is installed. I don't know if uninstalling the game would delete the entire directory if there are exported save files in there, so I would make a backups of exported save files into another directory. Later, if you install the game again, you should be able to import that save file.