Store leftover cheesecake in an airtight container or cover the springform pan tightly with plastic wrap. It will stay fresh in the refrigerator for up to 4–5 days. For longer storage, freeze individual slices on a baking sheet until firm, then wrap each slice in plastic wrap and place in a freezer bag. Cheesecake can be frozen for up to 2 months. Thaw overnight in the refrigerator before serving.