System that handles information that is necessary for the conduct of day-to-day business but does not materially affect support to deployed or contingency forces in the short-term would be categorized?

Such a system would be categorized as a "non-mission critical" or "administrative" system. These systems are essential for routine operations and management but do not directly impact the immediate effectiveness of deployed or contingency forces. While they are important for overall organizational efficiency, their failure would not significantly impair operational capabilities in urgent situations.