historical data MT5

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I'm curious to ask whether the historical data used for testing on MT5 provided by the broker is supplied by MetaQuotes or by the broker themselves.

If it is provided by the broker , why can't MT5 cloud use custom symbol data for calculations?

however, what data is using when we using  MT5 cloud computing ?

Creating and testing custom symbols in MetaTrader 5
Creating and testing custom symbols in MetaTrader 5
  • www.mql5.com
Creating custom symbols pushes the boundaries in the development of trading systems and financial market analysis. Now traders are able to plot charts and test trading strategies on an unlimited number of financial instruments.
 

The MT5 strategy tester downloads historical tick data from the broker's server.

If you are using the default Metaquotes MT5 terminal, then it will download historical data from Metaquotes server.

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