Setup MT not to delete historical data

Can I setup my MT not to delete historical data? I have an instance of a MT opened and working since February. In February I did having some mounth of historical data in M1 (I mean the initial data that you have when you open a chart for the first time). Since February I have some charts opened in M1. I notice that now I have data only from July.. Can't I setup my MT not to delete old data? My broker is Alpari.. I preferer data obtained by my MT instead of download data from some site. PS My broker is Alpari uk

Tools -> Options -> Charts -> change max bars in history and max bars on chart.

you will need to shut down then restart mt to complete the setup.