Seen on the wall of a server room…
IT Department Rules:
Don’t touch the keyboard without planning!
Change happens! But please don’t change something that works on the fly.
Make a BACKUP first. Of everything
Implement NEW FEATURE on a COPY of your site. NEVER on the original.
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Really makes you wonder what happened…and sympathize with the lost time and mental stress caused when you forget these basic rules for even “simple changes”.