"For security purposes I think it's important not to have people in your home office," he said.

Zbar said he thinks it's safer not only from a security standpoint, but that there is a liability issue, too.

"What if you have someone to the office and they trip and fall?" Zbar said "I have insurance that covers me for some of that stuff, but I don't want to have to go through that."

Forgetting to back up data

Ever had a sudden power outage and lost a few hours' work? Or worse, ever ? Data backups are a simple and necessary discipline.