Hola Andi! I’ve always used OOS, I was testing another software at the same time as FSB in 2017. With the search style they use OOS is very important. With it I still keep some of my data in my back pocket (about 3-6 months) just to really simulate and confirm simulated trading. This ensures at least for me the strategy has some strength I can depend on. Doing my method I may only find 1-5 strategies a day, but it helps me feel more secure with them. Even though we are testing on demo first, this keeps my demo free of clutter. Saves me time, space, and emotional excitement lol.