Help with Dukascopy data

[RobertRo101]

Hi, I downloaded the Dukascopy 1D data (Bid and Ask) form the JForex platform and I am trying to import it into MT4. I want to backtest using this data and I don't know if I should download the 1M data and then transform it to all timeframes? My strategy is only for the daily chart and I will backtest using Open Prices. Also, should I disconnect form the broker's server or what? I have no idea and can't seem to find anything helpful about this. And when I import the data into MT4 with History Center import, it shows that the daily candle closes at 21:00 and I don't that this is normal. Any help, please?