Because of the complexity surrounding the computers these days, maybe a poorly trained laity to solve emerging problems themselves. Although you can learn how to operate standard computer applications and you know how computer networks work, when big problems arise, the support staff must be on hand.
Just look at many computer manuals these days – sometimes they have a hundred pages or more. You can not be an expert without treating these manuals, but you will not have time to read the manuals either. So you need to hire experts if needed.
Regarding costs, which can be expensive, especially when it is necessary for the business computer support companies to internally train new employees and keep them. However, if your company is, you can certainly afford to have support staff on your payroll.
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The benefits you will get from the quick resolution of IT problems will be higher than the salary you give. Also, if you have a tight budget, one solution is to outsource your IT support. Because technical computer problems do not come often, outsourcing ensures that you will need IT support when you need it.
However, business IT support staff is not only troubleshooting. They may also have valuable skills that your business may need some time. Think of them as computer enthusiasts, not a repair team.