backtesting your strategy is never useless, even if you find out that the strategy that you are using does not work and it loses money at least now you know the truth and you can stop apply the strategy in the market, as I said backtesting should be applied under different market conditions, it is true that the volatility of the market is going to make that harder but you also need to apply your backtest when this market is going through a period of stability, that way you will get a better idea of how your system is going to perform under all kind of conditions.
You can't just stop backtesting and "not lose money" because backtesting is free, you just test whatever you want. I honestly think that backtesting is still useless because the future is not written and even if you think you know everything, you really do not know, but at the end of the day it is just another indicator that you could use, that is fine and I think it is not going to be really that difficult to use it for your advantage without hoping that you would be doing nothing at all instead.What I mean is, if you use backtesting, and take that as 100% true and use that strategy that means you could lose money (you could earn too) but if you do backtesting, and use that as another data that you have in your arsenal along with many other things, that means you will probably profit. So do backtesting, but do not make it 100% the reason why and how you trade.
