Different from MT4, MT5 builds its history from M1 Bars, so basically when you download the data you are downloading M1 data and the rest of the timeframes are being build based on that.
https://www.mql5.com/en/articles/384#1_2

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- www.mql5.com
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midnightwalker0:
Thank you. I also discovered mt5 calculates the spread based on the historical data which I think is great.
Different from MT4, MT5 builds its history from M1 Bars, so basically when you download the data you are downloading M1 data and the rest of the timeframes are being build based on that.
https://www.mql5.com/en/articles/384#1_2

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I understand that mt5 auto downloads history data when starting a back test but I was wondering if that is the data for all time frames or just the selected time frame? Would I need to run it on all time frames if I need the data from all time frames?