My webserver runs on Linux / CPanel; it hosts about six (not very busy) websites that run with PHP. The server also runs eMail for the websites and some functionality requires an SSL certificate.
I can handle day-to-day stuff (like updating the websites with page revisions and the like) but not the parts that require extensive server knowledge; therefore, I require an administrator who can be contacted every now and then to fix or upgrade something. Most things are not time-sensitive but some things, obviously, are - e.g., "websites all down" or "eMail down".