The binary backup will let you restore a perfect/complete copy of the config of the original router (A) on the new router(B). It will work. But DO reset the MACs, either manually or through a script as suggested.
Obviously, it should NOT be done if the original router (A) is still running as you'll have duplicates all over the place. Yes, officialy, it's not supported, but unofficialy, it works as long as you restore all MAC addresses. Do it while router (B) is off the network. Then, swap routers during your maintenance window.
Granted, it may not suit everybody's needs, but that's how it is. Imagine a complete backup in readable format falling into "hostile" hands. That would force a password change sprint in record time, provided you do it before the other with your password changes your routers. Arrrggh!!!
If you want to see everything for analysis, then restore to a standalone router and analyse away.
Alain Casault, Eng.
If I helped you, let me know!