--- title: "Redundant Licensing" --- # Redundant Licensing > ## Types of Redundant Licensing Redundancy is supported with Ignition, Ignition Edge, and Ignition Cloud Edition using standard licenses (six-character key) and leased licenses (eight-character key). When working with redundancy, the license for the backup node will contain the same modules as the master node. For example, if the master is storing history with the SQL Bridge module, then the backup would also require the module in the event a failover occurs. Otherwise, data would be lost. Traditionally, redundancy involves two standard licenses: one license will be applied to the master Gateway, and the other license will be applied to the backup Gateway. Since two standard licenses are being used, this approach allows users to disable redundancy, and set both Gateways to independent modes. ### Backup-Only Licenses Backup-only licenses are available for purchase. This license forces the Gateway into a backup mode, and the mode can not be changed while the license is applied. The benefit of this type of license is that they come at a discounted price. For more details, contact your Account Representative. If using a backup-only license, the Mode property on the backup Gateway's Redundancy page will look like the image below. ![" "](redundancy-backup-settings.png) Instead of the dropdown list that normally appears on this property, the license forced this Gateway into a Backup mode. If you would like to change the mode of this Gateway, the backup-only license must first be unactivated. Once unactivated, a new license will need to be applied. Otherwise, the Gateway will operate in the two hour trial mode.