Windows Server 2008 AD的备份和还原不再和Windows Server 2000或Windows Server 2003一样备份还原System States，而是需要备份CriticalVolumes.其中包含如下文件:
The system volume [This is the volume that hosts the boot files， which consists of the Bootmgr file and the Boot Configuration Data (BCD) store. ]
The boot volume[This is the volume that hosts the Windows operating system and the Registry. ]
The volume that hosts the SYSVOL tree
The volume that hosts the Active Directory database (Ntds.dit)
The volume that hosts the Active Directory database log files
Windows Server 2008的备份模式有如下三种：
Full server recovery
System state recovery
File/Folder recovery
可以使用Bcdedit.exe这个工具来切换使用正常模式还是目录服务还原模式来启动备份工具.
目录服务还原模式来启动:
bcdedit /set safeboot dsrepair
正常模式启动:
bcdedit /deletevalue safeboot
Windows Server 2008中，System state data至少包含如下数据(视服务器上角色的多少有多不同)：
Registry
COM+ Class Registration database
Boot files， as described earlier in this topic
Active Directory Certificate Services database
Active Directory Domain Services database
SYSVOL directory
Cluster service information
Microsoft Internet Information Services (IIS) metadirectory
System files that are under Windows Resource Protection
下面就和大家交流一下Windows Server 2008中ADDS的备份和还原文章分为以下部分：
1.安装Windows Server Backup备份工具
2.为域控制器做Critical-Volumes备份
3.为域控制器做Full Server备份
4.为域控制器备份做计划任务
5.为域控制器做非权威还原
6.为域控制器做权威还原
7.小结
◆一、安装Windows Server Backup备份工具
在Windows Server 2008中，默认情况下备份工具没有被预安装，需要自行添加
1、在运行中输入oobe以打开"Initial Configuration Tasks"
2、选择"Add Features"
3、选择"Windows Backup Features"，默认会安装"Windows Server Backup"，如果希望能在PowerShell下进行备份还原操作可附加选择"Command-line Tools"
4、安装过程
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