Number of Users Up to 50 users Active Directory High-Availability & Hybrid Authentication Active Directory Hybrid Authentication (ADHA), Tursted Domains, Microsoft Cluster Server & Hyper-V Live Migration support. Advanced Disk & Power Management Automatic hard drive spin-down assures the most efficient power consumption. & unnattended system shutdown without data loss in case of power failure. PC Backup & Restore with True Image Lite 2013 by Acronis Powerful backup software from Acronis protects content & recovers data in case of any disasters. (1 license included) Lenovo EMC Personal Cloud Backup Synchronize data between personal cloud member systems & your Network Storage device.