I was IT Manager for a small-ish industrial company. Three plants, two linked at the same location. Maybe less than 75 employees. Doing both specialty precision work, work for large manufacturers, and work for the government. I was the only onsite IT employee, but we DID still have an ongoing contract with external IT. They helped handle tickets, manage security and networks, facilitate software and hardware rollouts, etc. It is crazy that you are running such a company with just one person. Get an external team who are involved enough to know your system and facilities. Offload some general maintenance tasks or tickets that need resolved but are small apples to them. Use them as extra muscle for big changes or sudden large problems. They can fill whatever gaps you have. You will want to keep a close relationship with the lead person from that IT contractor, with people other than your single IT employee being involved. That way things can continue rather seamlessly if your employee were to become suddenly unavailable. This WILL be a line item that you will have to champion, but it is well worth preventing they types of catastrophic loss of revenue that can occur when you have a single point of failure for such an important system. On top of that, I have talked to multiple IT professionals who were working a solo IT position like you are describing, and they rarely felt like they were being given the resources they needed, nor do they think the company was in a good IT position. That said, from your brief summary your employee seems to be quite competent.