As exporting data to MT4 from DataManager takes an extraordinary amount of time a certain amount of confusion can occur when exporting multiple symbols. I am attempting to export 16 symbols and if close DataManager down part way through I cannot tell where I am up to when I restart DataManager again. I suggest a last exported date/time column as a way to quickly determine which is the next symbol to be exported.
I have attached a screenshot sowing the screen I am referring to