I noticed that in report explorer the old backtest is saved in a special folder, the problem is that if you do not remember to manually delete it resume permanently and the folder may reach sprawled dimensions, it's strange they did not think to this problem. So I happened that on a slow enough computer I could no longer open the same amibroker, so now every now I have to remember to clean the backtest history; Does anyone know if there is a function to do it automatically? thank you