I am trying to write a document that describes the frequency with which we perform a task. It is usually done daily, however I don't want to be tied to having to do it daily. Is there a more professional word I can use to mean near-daily?
I don't know of a word that means "near-daily" or "most days". Besides those terms, consider "almost-daily", "at most daily", and "daily (as needed)". If the task is always performed at the same time of day, you might refer to "the X task (as needed)" where X is, for example, dawn, morning, noon, afternoon, evening, or a specific time.