You’re talking with someone about getting married.

You’re planning to hand over all your savings to that person.
You don’t know the person’s income, you don’t know their credit history, and you don’t know whether they have any debts. You’ve only talked to them a few times, and you think they’re really nice.
Would you marry them? You wouldn’t.
You’d go crazy digging into their background—checking whether they have a criminal record, checking their salary transaction history, and checking why his ex left him.
Your strategy is the one you plan to marry.
Backtesting means checking its fundamentals—looking at all of its performance over the past five years. How much it earned, how much it lost, how bad it got at its worst, and whether it has a history of blowing up.
You and your strategy aren’t married yet, so you still have time to check. Send me your method, and I’ll help you look into its past.