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the 65th snapshot is taken, the oldest one is deleted Likewise, if the amount of disk space allocated for shadow copies has run out, the eldest snapshots is deleted to make space for the newest snapshot Some clients need a new software component installed that adds a tab to the share s Properties dialog This tab allows them to select a point-intime view of the share and access its content Newer operating systems, such as Vista, have VSS built-in This is great for users and administrators If a user deletes a le, she doesn t need to trouble an Administrator The user can view the share as it was at a point in the past and copy over the le Likewise, if a le has been corrupted, the user can view the share as it was in the past and copy over the uncorrupted version
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NOTE VSS does not replace performing backups because only the changes are stored If your le system was lost, the shadow copy information on its own would be of no use Microsoft has also stated that in times of exceptionally high I/O, shadow copies might be lost
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The amount of disk space used for the shadow copies is not based on the size of the volume, but rather the size and frequency of changes This is driven by the applications used For example, if an application only writes changes to the le when data is changed, this uses far less shadow copy space than an application that rewrites the entire le When accessing previous states of a share, the ACLs on les and folders still apply If you did not have access to the le before, you won t have access when viewing it via the Previous Versions client The shadow copy le or folder information is stored in the System Volume Information of the volume selected to hold the information and cannot be accessed outside of the shadow copy client Finally, although the whole content of the volume is protected by VSS, you can only view previous states via share properties If you need to recover a le that is not within a current share, create a new share that contains the le and then connect to the share Notice that if you create a new share, you see a full history of all previous versions equivalent to existing shares This happens because VSS logs the entire le system, not just existing shares You can enable VSS for a drive or volume with the following steps If you want to create from the command line, use the vssadmin command with the create shadow /for=<volume>: parameters 1 Right-click the drive and select Con gure Shadow Copies from the context menu
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2 Select the volume for which you want to enable shadow copies from the Select a Volume area 3 Click the Settings button to change the default The default con guration creates a shadow copy at 7:00 and 12:00 each week day, storing the data on the selected drive 4 In the dialog, you can choose which drive the shadow copy les are saved to (drive only, you cannot select folders) and the maximum amount of space that can be used (you need at least 100MB) Make your choices and click the Schedule button 5 The Schedule dialog has a drop-down at the top that shows the current scheduled executions of the shadow copy You can select one (click the drop-down arrow) and then use the options to change how often it runs The Weekly option allows a time to be selected and on which days to run You can also click New to create a new schedule For example, you might want a schedule that runs just once on Saturday and Sunday at 7:00 Click OK when all options are made 6 Click OK to the main Settings dialog 7 The shadow copy is now enabled (You don t need to click the Enable button) You can optionally click the Create Now button to create a starting snapshot The Create Now button can be used at any time to force creation of a shadow copy Windows Vista clients (Business and Ultimate editions) have a Restore Previous Versions context menu item for shares This can be used to view the contents of the shadow copies and restore or copy data from them Windows XP SP2 also has VSS built-in For other operating system support, check out wwwmicrosoftcom/technet/downloads/winsrvr/ shadowcopyclientmspx
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