Traders need a profitable trading strategy in order to make a consistent profit in the forex market. Backtest is essential to show how well your strategy work. It works in a kind of demo platform. So, there is a human emotion involved. It will not give your 100% accurate information. But it will give the high possibility to get a higher result in live trading. All trading strategies are not allowed in certain brokers where may not backtest your desirable strategy. But my broker Tpglobalfx allow all kind of trading strategy.