IMVHO you should run off backups of each strain individually, or ONE male crossed with females of many strains, so you know who'surdaddy. Big issue with seed backup. If you are forced to do it by herms, just do one strain at a time. If you want to make a known cross, put in the one you want to be pollen donor 2 weeks early and mess up its light schedule until you see nanners, THEN put in the female on a CORRECT light cycle so SHE doesn't flip on ya.