Allow the cake to cool completely before storing it. Place the cooled cake in an airtight container or a cake tin with a tight-fitting lid. Store the cake in a cool and dry area of your kitchen or pantry. If you plan to consume the cake after a few days, storing it in the refrigerator is a good option. To prevent the cake from drying out, wrap the cake properly in plastic wrap or place it in an airtight container. When ready to serve, allow the cake to come to room temperature before serving it. Store it in the refrigerator for up to one month. If you want to store the cake for a longer period, freezing is a suitable option. Wrap the cake tightly in plastic wrap, followed by an additional layer of aluminum foil to prevent freezer burn. Place the wrapped cake in a freezer-safe container or sealable freezer bag. You can store the frozen plum cake for up to 3 months.