Preheat the oven to 300 degrees F.
Line an 18x26-inch baking sheet with parchment paper.
On a cutting board with a serrated knife, slice the bread into 1-inch-thick slices.
Transfer the bread slices to the prepared baking sheet, spreading them out in a single layer.
Bake the bread slices until crusty, about 10 minutes.
Grease a 9x13-inch baking dish.
In a medium bowl with a pour spout, add the eggs, 1 cup of the apple cider, the milk, 1/2 cup of the brown sugar, the orange zest, the vanilla extract, the cinnamon, and the salt, and whisk to combine. Set it aside.
Dip the crusty bread slices into the egg mixture, taking care to soak both sides.
Transfer the soaked bread slices to the prepared baking dish, lining the slices next to each other.
Evenly pour any of the remaining egg mixture over the top of the bread slices. Set it aside.
In a large skillet over medium heat, melt the butter.
Add the apples, the remaining apple cider, the remaining brown sugar, the remaining 1 teaspoon of cinnamon, the allspice, the nutmeg, and the remaining 1/8 teaspoon of the salt to the melted butter and cook, while stirring occasionally, until the apples have slightly softened, about 8 minutes.
Transfer the apple mixture from the stovetop to a wire rack.
Add the pecans to the apple mixture and stir to combine.
Evenly spoon all of the apple mixture and the juices over the top of the soaked bread slices.
Tightly cover the bake and transfer it to the refrigerator to marinate and soak up the egg mixture for at least 3 hours and up to 24 hours. Do not skip this step.
Preheat the oven to 350 degrees F.
Uncover the bake and bake, about 20 minutes.
Cover the bake with aluminum foil and bake again until the center appears set and is no longer runny, about 25-35 minutes.
Transfer the bake from the oven to a wire rack and let it cool for 5 minutes. The bake will deflate slightly during cooling.
Serve the bake topped with the confectioners' sugar, the maple syrup, and the salted caramel sauce.