I'm aware that your able to transfer characters from old-gen to next-gen, but are you able to do it reverse? In other words next-gen to old-gen and all of your data will be the same.
(Edit): Will DLC transfer too? I recently purchased the expansion pass for my Xbox One and would like to know if it too transfers back.
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Yes your characters will transfer back and forth.
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Your characters/progression is saved on Bungies side, and tied to your username. As long as you use the same username you can play on both.