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Not having a backup or turnover process in place is a rookie move made by companies that haven't reached a maturity.

Thinking the employee is sabotaging by leaving the company is a sign you don't understand what the role of an employee is. You are not 5 friends hacking together a game and if someone quits because they get a girlfriend you call them a dick. You are a resource that has been purchased and assigned to work on a specific task. The company hopes to leverage something you do into a profit or as support for a business unit.