Does the Savegame Extractor/Installer allow you to play multiple towns whenever I want? Lets say I backed up my save and then restarted my town with the intention of installing the save again later, will this affect my save at all? And if I backup a save of the town I got when I restarted can I alternate lets say every other month between playing both towns? Plus, will this affect WiFi?

Thanks in advance,
Zach