I have difficulty in getting longer historic data for backtesting. I currently use IB for data source to backtest my strategies with some futures like GC, SI, CL, ES, etc., however, IB seems only provide about 2 years historic data, How can I get more and longer historic data? Is there any format issues?
and the backtest results for very similiar contracts like GC and YG (they are both for Gold products, but from different exchange) are quite different. data difference reasons? Hopefully get help.
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