Hello 
@MansionMarijuana ! Back crossing is a technique to fix certain traits  by creating a population from the genetics of a single parent (the recurrent parent). This can be achieved by crossing one of the progeny (F1, F2,F3......) with one of the original parents (recurrent parent) which has the trait that you want. No matter if you have  IBL, S1, BX, F1 or what ever a clone has exactly the same genetic code. Happy growing ! 👊