I recently made a schema change to a feature class with editor tracking enabled. I exported my data to a feature class in a different database, made the change, then used Load Objects to bring the data back in. When I brought the data back in, all the editor tracking fields changed to the date and time of the load. I didn't think ahead of time how this would affect the editor tracking fields-- is there any way to populate the editor tracking fields in the original data set with the values of the backup data set (which are still the original values)?