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Why did you post your MT4 question in the MT5 General section (a miscellaneous catch-all category) instead of the MQL4 section, (bottom of the Root page)?
General rules and best pratices of the Forum. - General - MQL5 programming forum? (2017)
Next time, post in the correct place. I have moved this thread. -
The download is always from MetaQuotes, overwriting your broker's data.
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On MT4: if you don't have any history, here's how you can get all available from your broker.
- Most brokers only have 32 or 65K bars of history per timeframe. That's 45 days of M1, 2.5 years on M15, etc.
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Quickly DL all available history from your broker: Problem loading historical data - MQL4 programming forum (2010)

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I have couple of questions:
In MT4:
1. When I double click for example in XAUUSD D1, this data is downloaded from trade server, right?
2. When I select Download, this gives you an alert saying that data will be downloaded from MetaQuotes, so, data is overrided with MetaQuotes instead of trade server.. right?
3. Which data should I be using then to backtest? MetaQuotes or trade server...
If anyone have answers to any of this questions will be really appreciated! Thanks everyone!