Properly reverting to a cashed state

Hey Guys! Im working on a RTS/TBS with some small time mechanics~ Anyway, for playback I need to revert to an earlier state...

But I don't think i'm doing it in an efficient way because whenever I reset, Start is called before all the Gameobjects are in the right order and initialized~

The symptoms of this are: Things like GameObject.Find, or GetComponent often return Missing:

So anyway here is some of the relevant parts of my code:

 public void ReplaceAllUnits(int ChildNumber){

//ChildNumber represents the time stamp i want to replace with (IE: 1 would be the first save done, and 2 would come right after)

     Transform AllUnits = this.transform.FindChild(ChildNumber.ToString());
     //gets the cashed all units
     AllUnits.parent = null;

     Destroy(GameObject.Find("AllUnits"));
     // out with the old AllUnits

     AllUnits.name = "AllUnits";

     AllUnits.gameObject.SetActive(true);
     Debug.Log ("DONE");
                 
     }

And how I cash ALL UNITS:

 public void CashAllUnits(bool RemoveAll){
         string Name = (this.transform.childCount).ToString();
         
         GameObject AllUnits = GameObject.Find("AllUnits");

         GameObject NewUnitCopy = Instantiate(AllUnits) as GameObject;
         NewUnitCopy.SetActive(false);
         NewUnitCopy.transform.parent = this.transform;
         NewUnitCopy.name = Name;
         
     }