I can’t get the backtested data of my nifty options strategy before the year 2019. Say if I run my strategy for backtesting from 2017 Jan to 2023 Jan, I get the results from 2019 Feb onwards to Jan 2023. But I have seen in some of the algotest related videos the backtested results of 2017.

Nifty weekly option trading started in Feb 2019.