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One thing i instill in all the juniors I mentor is always always be in control of your own destiny when making a change on production systems, never rely on the infra backups being fit for purpose, never assume anything you haven't seen with your own eyes or done with your own fingers is there, even then be sure that you have copied what you think you have. Being able at very worst to just be able to put everything back how it was and walk away for another day is the key to a happy techie.