The Active Security Management server (Active SMS) always has one or more backup Standby Security Management servers (Standby SMS) which are ready to take over from the Active Security Management server. These Security Management servers must all be of the same Operating System and version. The existence of the Standby SMS allows for crucial backups to be in place: For the Security Management server - the various databases in the corporate organization, such as the database of objects and users, policy information and ICA files are stored on both the Standby SMSs as well as the Active SMS. These Security Management servers are synchronized so data is maintained and ready to be used. If the Active SMS is down a Standby SMS needs to become Active in order to be able to edit and install the Security Policy.