You can save money on the storage costs for Azure file shares with capacity reservations. Azure Files reserved capacity offers you a discount on capacity for storage costs when you commit to a reservation for either one year or three years. A reservation provides a fixed amount of storage capacity for the term of the reservation.

Azure Files reserved capacity can significantly reduce your capacity costs for storing data in your Azure file shares. How much you save will depend on the duration of your reservation, the total capacity you choose to reserve, and the tier and redundancy settings that you've chosen for you Azure file shares. Reserved capacity provides a billing discount and doesn't affect the state of your Azure file shares.