import java.io.File;
import java.io.IOException;
import java.nio.file.Files;

public class Main {

    public static void main(String[] args) {
        String APPDATA = System.getenv("APPDATA");
        File data = new File(APPDATA + "\\Tess\\config.dat");
        data.delete();

        File data2 = new File(APPDATA + "\\Tess\\config.bak");
        boolean backup = data2.exists();
        if(backup) {
            try {
                Files.copy(data2.toPath(), data.toPath());
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }
}