Which of the following services is NOT provided by vCenter Server?

vCenter Server is a vital component in the VMware architecture that provides centralized management for vSphere environments. It includes various services that enhance the management and operation of virtual infrastructure.

Among the listed choices, backup and restore services are not directly provided by vCenter Server itself. Instead, vCenter focuses on resource management, monitoring, and administration of virtual machines and hosts. Organizations typically implement third-party backup solutions or use VMware's own products like VMware vSphere Data Protection or other integrated backup software to handle backup and restore processes.

On the other hand, vSphere Client services are essential for user interface interactions with vCenter, allowing administrators to manage their vSphere environment efficiently. vCenter Single Sign-On provides a mechanism for unified authentication across vSphere components, which enhances security by allowing users to authenticate once to access various services. Lastly, the VMware Certificate Authority is responsible for managing certificates that secure communications within the VMware environment, ensuring trusted connections.

Thus, the correct answer reflects that backup and restore services are not a native function of vCenter Server.