» Thu Sep 08, 2011 8:45 pm
You can save on PS3 at any time just like PC
When you get the warning about not being able to go back if you start the final part of the main quest, then if you ignore it you trigger the end game battle, and then there's no going back except to an earlier save!
If you only have one save then you presumably did not make any manual saves, and the game only keeps the last autosave ...