Maybe if the game allowed for 3 rolling saves. The places where it Autosaves: Before Battle, After Battle, on Campaign Map, and or Fleet Organization screen. All saves Timed Stamped.
Player could manually but would have to name it differently to try other strategies, because autosave system kick in from what save you start with.
So if you have a main save called Alpha. There would be after 3 autosaves. Alpha1 (current save), Alpha2, (previous save), Alpha3 (previous save).
Alpha1 would load automatically on continue.
to restart from the other 2 autosaves you would have to manually load them.
Any other saves created would have to be renamed (beta) and then subsequently manually loaded.
Also if you continue from a manually loaded save beta. When you enter battle the game would overwrite Alpha 3 as the new AutoSave1..and continue overwriting the autosaves in rotation until that is main save.
It is a system that works well on Football Manager. I'm not sure if I explained it well enough.