One of the key functions in algo trading is backtesting testing a strategy against historical data to see if the plan works or not before risking capital. But in 2025, as markets contorted by AI evolution, regulations and international instability reevaluated the certainty of historical data Take it easy just keep reading on as I am going to spell out 5 main possibilities that you can actually implement in your own backtesting practice into proper image from real world type of tradingbery. Ea...