It depends on your building preference. Do you want a back that is responsive or one that remains stiff? Responsive backs are made to move (thinner) and stiff backs are thicker. No one should give you a number without knowing that, the wood type, some sense of how stiff your particular set is, how you intend to brace it, and the size of the guitar you are making. It could be anywhere between .090" and .130".
I typically reduce thickness until the back will flex in my hands the way I want it to. I build a responsive back.
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“Reason is itself a matter of faith. It is an act of faith to assert that our thoughts have any relation to reality at all.”
― G.K. Chesterton
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