It's really scary how quickly we have lost/destroyed the genetic diversity of plants, animals. I just read this sobering CBC article that shares some of the bleak stats from the latest UN scientific reports. We do our best to do our part to help. I grow and save only heirloom seeds .. about 19 types of tomatoes this year - keeping it alive in our back yard where we have control.
http://www.cbc.ca/news/technology/un-biodiversity-reports-1.4589698?cmp=FB_Post_News
I applaud your work homesteading, preserving tomato and apple varieties, especially in light of the degradation of the natural environment and the dismal projections of species die off.
This is very worrisome as diversity is a measure of ecological durability and resilience (though not necessarily of vitality which is what is implied by "health"; evidently scientists are not the best with language).