Large environments may contain multiple Backup Exec servers responsible for backing up many different client systems. Backup Exec servers in large environments can run independently of each other if each server is managed separately. Separate server management may not be an issue if there are only two or three Backup Exec servers, but it can become unwieldy as the environment grows. Backup Exec can centralize the management of multiple Backup Exec servers using an add-on option called the Backup Exec Central Admin Server Option (CASO). CASO ensures that everything throughout the network is protected by a single system that can be managed from one console and also balances the workload across all Backup Exec servers in the environment.