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Shadow Copies of Shared Folders
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Windows Server 2003 supports another way for administrators and users alike to recover quickly from damage to files and folders. Using VSS, Windows Server 2003 automatically caches copies of files as they are modified. If a user deletes, overwrites, or makes unwanted changes to a file, you can simply restore a previous version of the file. This is a valuable feature, but is not intended to replace backups. Instead, it is designed to facilitate quick recovery from simple, day-to-day problems not recovery from significant data loss.
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Enabling and Configuring Shadow Copies
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The Shadow Copies feature for shared folders is not enabled by default. To enable the feature, open the Properties dialog box of a drive volume from Windows Explorer or the Disk Management snap-in. In the Shadow Copies tab, as shown in Figure 7-8, select the volume and click Enable. Once enabled, all shared folders on the volume will be shadowed; specific shares on a volume cannot be selected. You can, however, manually initiate a shadow copy by clicking Create Now.
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Figure 7-8 The Shadow Copies tab of a volume s Properties dialog box
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If you click Disable, you delete all copies that were created by VSS. Consider carefully whether you want to disable VSS for a volume or whether you might be better served by modifying the schedule to prevent new shadow copies from being made.
The default settings configure the server to make copies of shared folders at 7:00 A.M. and noon, Monday through Friday; and 10 percent of the drive space, on the same drive as the shared folder, is used to cache shadow copies. Each of the following settings can be modified by clicking Settings in the Shadow Copies tab:
Storage volume To enhance performance (not redundancy), you can move the shadow storage to another volume. This must be done when no shadow copies are present. If shadow copies exist, and you want to change the storage volume, you must delete all shadow copies on the volume, then change the storage volume. Details The dialog box lists shadow copies that are stored and space utilization statistics.
Lesson 3
Advanced Backup and Restore
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Storage limits This can be as low as 100 MB. When the shadow copy runs out of storage, it deletes older versions of files to make room for newer versions. The proper configuration of this setting depends on the total size of shared folders on a volume with shadowing enabled; the frequency with which files change, and the size of those files; and the number of previous versions you wish to retain. In any event, a maximum of 63 previous versions will be stored for any one file before the earliest version is removed from the shadow storage. Schedule You can configure a schedule that reflects the work patterns of your users, ensuring that enough previous versions are available without prematurely filling the storage area and thereby forcing the removal of old versions. Remember that when a shadow copy is made, any files that have changed since the previous shadow copy are copied. If a file has been updated several times between shadow copies, those interim versions will not be available.
Using Shadow Copy
Shadow copies of shared folders allow you to access previous versions of files that the server has cached on the configured schedule. This will allow you to
Recover files that were accidentally deleted. Recover from accidentally overwriting a file. Compare versions of files while working.
To access previous versions, click the properties of a folder or file and click the Previous Versions tab, as shown in Figure 7-9.
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Figure 7-9
The Previous Versions tab of a shared resource
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The Previous Versions page will not be available if Shadow Copies is not enabled on the server, or if there are no previous versions stored on the server. It will also be unavailable if the shadow copy client has not been installed on your system. This file is located in the %Systemroot%\System32\Clients\Twclient\x86 folder of a Windows Server 2003 system. The Windows Installer (.msi) file can be deployed using Group Policy, Systems Management Server (SMS), or an e-mail message. Finally, the Previous Versions page is available only when accessing a file s properties through a shared folder. If the file is stored on the local hard drive, you will not see the Previous Versions tab, even if the file is shared and VSS is enabled. See this lesson s Practice for an example. You can then choose to Restore the file to its previous location or Copy the file to a specific location.
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