Barney having back-up playbooks is completely in character, if you ask me. I was not at all surprised he'd have one.
I also am not surprised that Barney would have a "back-up" Playbook. What I AM
surprised at, though, is how the demise of the first one was sold to us: It was the last play Barney would ever run. It felt cheap for there to still be a playbook at all.