I was always taught to unstring a bow if you did not shoot it daily and hang it horizontally on two pegs attached to an interior wall. That way the limbs would not be under any stress during storage and the interior wall is not as subject to any extreme temperature changes as a wall exposed to the sun would be.
I have always wanted to hang mine vertically from pegs, but the thought that gravity could effect tiller has prevented me from doing so long term.
NEVER store a bow by leaning it in a corner or against the wall for any length of time.
I believe I read most of that from a Bear Archery "how to care for your new Bow" owners manual... But it was a LONG time ago.
Hope this helps and All the Best,
Stump