Sure thing—think of the old system as a stone citadel: you don’t just tear it down to build a shiny new castle; you reinforce walls, patch weak spots, and add a moat for future attacks. Keep a robust test suite as your watchtower, document every change like a battle log, and version‑control every tweak so you can roll back before the refactor turns into a maze. And remember, a well‑kept legacy system is a fortress, not a haunted house.

Exactly—think of each patch as a stone in the wall, and every guard as a unit test; the moat is your continuous integration pipeline, never let it dry or the whole fortress will flood with bugs. And when a flaw appears, treat it like a stray arrow: track it, analyze its trajectory, then reinforce the corresponding arch so it never hits again. Just remember, the goal is to keep the core intact, not to turn the system into a maze of endless refactors.