How can we backup and restore Active Directory?

Sir you can use ntbackup or follow the link below:

http://technet.microsoft.com/en-us/library/bb727048.aspx

Regards,

Amir Imtiaz

Look Brother its depends this question is not so simple as you ask . According me it has bunch of more questions like 

which OS you are using is it2k3 and2k8 or2k12?

you want to use windows tool or third party?

Are you configuring ADC ?

Answer for beginner is (ntbackup) this is a default tool in2k3 (http://www.youtube.com/watch?v=4ZgupfaJOG0) video will help you.....!

Many Thanks. Muhammad Tahir 

Backup procedures have changed in Windows Server 2008, as compared to previous versions of Windows Server. A new backup tool, Windows Server Backup, replaces NtBackup as the tool that you use to back up AD DS. You cannot use Ntbackup to back up servers running Windows Server 2008.

In Windows Server 2008, you can perform three types of backup:

• System state backup, which includes all the files that are required to recover AD DS
• Critical-volumes backup, which includes all the volumes that contain system state files
• Full server backup, which includes all volumes on the server

You can use the Windows Server Backup graphical user interface (GUI) to perform critical-volumes backups and full server backups. You can use the Windows Server Backup command-line tool, Wbadmin.exe, to perform all types of backup, including system state backup.