I think he means he uninstalled Spore complete then reinstalled and repatched to 3, i now dont believe that you can independantly remove a specific patch.
In response to the original question, it isnt possible to save a backup of your game saves for use when you reinstal Spore, i tried and like you i got my planets but none of my creatures/buildings/vehicles etc were associated to the planets so i just deleted that game and restarted lol
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