Each broker has different data providers. Sometimes they also combine and filter the data for their purposes. Also, different brokers have data feeds from different timezones. It all makes it necessary to generate strategies specifically for our broker on the exact data we are going later to trade.

Anyway, testing a strategy on different data sets is an additional check for curve fitting. Some traders believe that if a strategy works on different data, it is more robust.

Fortunately, it is very easy to test that with EA Studio. To do it, import data from different brokers. Be sure they have similar length and quality. Then, when you create a strategy on one of the data sets, re-test it on the other data simply by changing the Server name in the Editor. EA Studio will recalculate the backtest automatically.