Or you can launch the game via a batch file and have it automatically make a backup copy (with a timestamp) before it starts the game, every time!
Create a new text file on your desktop, rename it to something like GenZ.bat and paste the following code in the batch file:
@ECHO OFF
SETLOCAL
REM Change the number 012345689 below to match the number in your own Save folder!
SET "game_save_id=012345689"
SET "game_save_base_folder=%USERPROFILE%\Documents\Avalanche Studios\GenerationZero\Saves"
FOR /F "TOKENS=2 DELIMS==" %%A IN ('WMIC OS GET LOCALDATETIME /VALUE') DO SET "dt=%%A"
SET "dt_stamp=%dt:~0,4%-%dt:~4,2%-%dt:~6,2%_%dt:~8,2%-%dt:~10,2%-%dt:~12,2%"
SET "source=%game_save_base_folder%\%game_save_id%"
SET "target=%game_save_base_folder%\%game_save_id%_%dt_stamp%"
ROBOCOPY "%source%" "%target%"
IF NOT %ERRORLEVEL% EQU 1 GOTO CopyFailed
START "" "steam://rungameid/704270"
GOTO End
:CopyFailed
ECHO.
ECHO Skipped starting the game because the save files could not be copied.
ECHO Please check if the given [game_save_base_folder] and [game_save_id] in the batch file are correct.
ECHO.
PAUSE
:End
ENDLOCAL
Change the number for game_save_id (012345689) to match the name of the sub folder in your Save folder. (Don’t remove the double quote at the end of the line!)
If you want to replace the standard shortcut for the game on your desktop and have a nice icon in stead of the ugly batch file icon:
1 Move the batch file to your save folder.
2 Right click and drag to your desktop and select “Create Shortcut”.
3 Rename the shortcut to your liking.
4 Change the icon via the properties of the shortcut (right click it).
Assuming you have everything installed in the default locations:
If you want the exact same icon that Steam places on your desktop: browse to C:\Program Files (x86)\Steam\steam\games and select the correct icon.
If you want a slightly different one: browse to C:\Program Files (x86)\Steam\steamapps\common\GenerationZero, choose GenerationZero_F.exe and select the correct icon.
Just be aware that your free disk space will reduce by 5 MB each time you launch the game through the batch file.
Have fun!
Edit: If you really want to be safe you can, of course, also change the target to point to a completely different folder or drive. For example:
SET "target=D:\BackupSaves\GenerationZero\%game_save_id%_%dt_stamp%"