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Originally Posted by forextrend
may someone explain to me why it is important to have a copy of these files?
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forextrend,
The data you getting from the broker server while you are running your demo account is filled with gaps and missing a lot of real data. You can't relay on this data in your strategy testing. So you have to download a complete history data and import it to MetaTrader to have the opportunity to get more accurate results.
You need to have a complete data for all the timeframes available in MetaTrader (1 minute, 5 minutes, 15 minutes, 30 minutes, etc). But if you can get a complete 1 minute data it will be easy to use the
Period_Converter script shipped with MetaTrader to convert the 1 minute data to all the other timeframes data.