Leafs,
Apologies: did not intend to "lose" you - however such is the nature of things sometimes...
Hopefully you can make a list of "taskings" and questions before the IT folks arrive. Gives them some direction and specific objectives to determine when the job is finished.
Hopefully you will get a tech support person who will have a few extra minutes to provide some explanation to you.
It is to your benefit to at least have some further understanding of the bigger picture. Start a 3-ring binder in which to keep system information. Documentation is often lacking in small business IT environments. Diagrams, repairs, upgrades - anything related to your network and devices.
Not life and death per se but I am sure you understand the need for medical documentation. Somewhat the same as so much depends on your IT environment.
As the defacto IT person that system documentation information will be helpful for you and future IT tech visits. Even if it is not all understandable in some ways. Also give some thought to disaster recovery planning. E.g., total loss of your server.
In any case, make sure that the backups are being done, safely stored with copies off-site, and, most importantly, quickly and fully retrievable.