What causes the most stress in your business? If you are like me you can handle the business piece fairly zen like. When the stress is cause by a tech breakdown, I go ballistic. The stress is because I have no control and nothing I do will fix that. My business is at the mercy of some faceless tech at the other end of a phone line. That is if I can get through to technical support. The business is completely crippled if there is no redundant back system in place. Always have a backup plan if you lose power or if your POS server goes down.
Trust me on this one, when stress level exceeds 13 on a 10 scale having a backup plan will help moderate the tech disaster.