Where can I download free historical data for backtesting and optimization?
Your broker will always be the best option
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I spoke to the broker and he told me that the historical data available in the MT4 is what is available and I need older data.
I won’t name names, otherwise I’ll get another warning, but there are several well-known data providers from whom you can obtain Forex data and import them in MT4/5. M1 data should be perfectly adequate for backtesting, unless you have scalper bots. I use the data myself for the robustness tests of my bots.
Most brokers provide it for free through their platforms. Just open a demo account, go to the data section, and download historical candles for your preferred pairs and timeframes.