You press start and then press save game.
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The Sims 3 have 4 save slots.
Sorry to say but you just got to lose all the unsaved data. So for future remember to save a lot!
You have to go to edit town and then you have to save and copy your family onto the clipboard then save it and when you get back to the game go on your computer or phone and click on MOVE then all you have to do is select town and family and there you go....I have the game late night and the regular sims 3 so it works
You can't undo it when you save.
you just select new game and save it to the meomry card