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A snapshot is a shadow copy—created by the Volume Shadow Copy Service (VSS)—of the volumes that contain the Active Directory database and log files. With Active Directory snapshots, you can view the data inside such a snapshot on a domain controller without the need to start the server in Directory Services Restore Mode.
Windows Server 2008 has a new feature allowing administrators to create snapshots of the Active Directory database for offline use. With AD snapshots you can mount a backup of AD DS under a different set of ports and have read-only access to your backups through LDAP.
There are quite a few scenarios for using AD snapshots. For example, if someone has changed properties of AD objects and you need to revert to their previous values, you can mount a copy of a previous snapshot to an alternate port and easily export the required attributes for every object that was changed. These values can then be imported into the running instance of AD DS. You can also restore deleted objects or simply view objects for diagnostic purposes.
It does not allow you to move or copy items or information from the snapshot to the live database. In order to do that you will need to manually export the relevant objects or attributes from the snapshot, and manually import them back to the live AD database.

Steps for using Snapshot:
1. Create a snapshot:
open CMD.exe, Ntdsutil, activate instance ntds, snapshot, create, list all.

2. Mounting an Active Directory snapshot:
Before connecting to the snapshot we need to mount it. By looking at the results of the List All command in above step, identify the snapshot that you wish to mount, and note the number next to it.
Type Ntdsutil, Snapshot, List all, Mount 2. The snapshot gets mounted to c:\$SNAP_200901250030_VOLUMEC$. Now you can refer this path to see the objects in these snapshots.

3. Connecting an Active Directory snapshot:
In order to connect to the AD snapshot you’ve mounted you will need to use the DSAMAIN command. DSAMAIN is a command-line tool that is built into Windows Server 2008. It is available if you have the Active Directory Domain Services (AD DS) or Active Directory Lightweight Directory Services (AD LDS) server role installed.
After using DSAMAIN to expose the information inside the AD snapshot, you can use any GUI tool that can connect to the specified port, tools such as Active Directory Users and Computers (DSA.msc), ADSIEDIT.msc, LDP.exe or others. You can also connect to it by using command line tools such as LDIFDE or CSVDE, tools that allow you to export information from that database.
dsamain -dbpath ” c:\$SNAP_200901250030_VOLUMEC$\Windows\NTDS\ntds.dit” -ldapport 10289

The above command will allow you to access the database using port 10289.
Now you can use LDP.exe tool to connect to this mounted instance.

4. Disconnecting from the Active Directory snapshot:
In order to disconnect from the AD snapshot all you need to do is to type CTRL+C at the DSAMAIN command prompt window. You’ll get a message indicating that the DS shut down successfully.

5. Unmounting the snapshot:
Run command, Ntdsutil, Snapshot, List all, Unmount 2.

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