What it is
A habit, baked in
Snapshot or back up the thing about to change, make the change in a small step, verify, and keep the path back open. Reversibility is how Fleet and Core act by default, not an afterthought.
Why it matters
Undo makes speed safe
Irreversible actions are where automation gets frightening. If every step can be walked back, speed stops being risky — the worst case is a quick restore, not a permanent loss.
A worked example
Backup, then act
Every production edit in this very portfolio is preceded by a backup and followed by a verify — so any change can be rolled back the moment something looks wrong.