Regarding the preservation of old issues of Genii (or any magazine, for that matter), the best bet is to have them bound into hardcover volumes. That way they won't continue to deteriorate (chipping of edges, etc.). It's not as expensive as you would think.
If you are NOT going to bind your issues, then keep them upright on shelves, tightly together, in a cool dry room. You don't want mildew to start growing.