As an old IT guy this excuse has me laughing out loud! 😆 The most common corporate email system, Exchange, is host based. Some businesses and government agencies have switched to Gmail and it is host based, too. In all of my years in the IT business I have never run across an email system that was susceptible to a local disk drive failure. This makes no sense! Why would anyone put in a system that stupid? This would require a level of incompetence I have trouble imagining.