Click OK in the final two boxes and the process is complete. All Collections. Backups and Snapshots. Written by Katarina Ondrejovicova Updated over a week ago. Learn More. Did this answer your question? The Volume Shadow Copy Service notifies all the writers to prepare their data for making a shadow copy.
Each writer prepares the data as appropriate, such as completing all open transactions, rolling transaction logs, and flushing caches. When the data is ready to be shadow-copied, the writer notifies the Volume Shadow Copy Service.
The application freeze is not allowed to take longer than 60 seconds. The Volume Shadow Copy Service flushes the file system buffers and then freezes the file system, which ensures that the file system metadata is recorded correctly and the data to be shadow-copied is written in a consistent order.
The Volume Shadow Copy Service tells the provider to create the shadow copy. At this point applications are free to resume writing data to the disk that is being shadow-copied. The shadow copy creation can be aborted if the writers are kept in the freeze state for longer than 60 seconds or if the providers take longer than 10 seconds to commit the shadow copy. The requester can retry the process go back to step 1 or notify the administrator to retry at a later time.
If the shadow copy is successfully created, the Volume Shadow Copy Service returns the location information for the shadow copy to the requester.
In some cases, the shadow copy can be temporarily made available as a read-write volume so that VSS and one or more applications can alter the contents of the shadow copy before the shadow copy is finished. After VSS and the applications make their alterations, the shadow copy is made read-only. This phase is called Auto-recovery, and it is used to undo any file-system or application transactions on the shadow copy volume that were not completed before the shadow copy was created.
A hardware or software shadow copy provider uses one of the following methods for creating a shadow copy:. Complete copy This method makes a complete copy called a "full copy" or "clone" of the original volume at a given point in time. This copy is read-only. Copy-on-write This method does not copy the original volume. Redirect-on-write This method does not copy the original volume, and it does not make any changes to the original volume after a given point in time.
Instead, it makes a differential copy by redirecting all changes to a different volume. After the mirror connection is broken, the original volume and the shadow copy volume are independent. The shadow copy storage area can be on the same volume or a different volume. This preserves a copy of the data block on the original volume before the change overwrites it. The copy-on-write method is a quick method for creating a shadow copy, because it copies only data that is changed. The copied blocks in the diff area can be combined with the changed data on the original volume to restore the volume to its state before any of the changes were made.
If there are many changes, the copy-on-write method can become expensive. Instead, the change is written to another volume's shadow copy storage area. Like the copy-on-write method, the redirect-on-write method is a quick method for creating a shadow copy, because it copies only changes to the data. The copied blocks in the diff area can be combined with the unchanged data on the original volume to create a complete, up-to-date copy of the data.
There are two types of shadow copy providers: hardware-based providers and software-based providers. There is also a system provider, which is a software provider that is built in to the Windows operating system. Hardware-based shadow copy providers act as an interface between the Volume Shadow Copy Service and the hardware level by working in conjunction with a hardware storage adapter or controller.
The work of creating and maintaining the shadow copy is performed by the storage array. Hardware providers always take the shadow copy of an entire LUN, but the Volume Shadow Copy Service only exposes the shadow copy of the volume or volumes that were requested. A hardware-based shadow copy provider makes use of the Volume Shadow Copy Service functionality that defines the point in time, allows data synchronization, manages the shadow copy, and provides a common interface with backup applications.
However, the Volume Shadow Copy Service does not specify the underlying mechanism by which the hardware-based provider produces and maintains shadow copies. These providers are implemented as a user-mode DLL component and at least one kernel-mode device driver, typically a storage filter driver.
Unlike hardware-based providers, software-based providers create shadow copies at the software level, not the hardware level. A software-based shadow copy provider must maintain a "point-in-time" view of a volume by having access to a data set that can be used to re-create volume status before the shadow copy creation time. An example is the copy-on-write technique of the system provider.
However, the Volume Shadow Copy Service places no restrictions on what technique the software-based providers use to create and maintain shadow copies. A software provider is applicable to a wider range of storage platforms than a hardware-based provider, and it should work with basic disks or logical volumes equally well. A logical volume is a volume that is created by combining free space from two or more disks.
In contrast to hardware shadow copies, software providers consume operating system resources to maintain the shadow copy. You will be prompted to browse to a folder to create the new database. All you have to do is, select a folder and press 'OK'. This will create a new database. Even though this process created a new database for you, your VSS Admin tool is still connected to your default database called 'Microsoft Visual Studio'.
This will show you a small dialog box with the list of previously connected databases. Since you have not yet connected to your new database, it will not be listed. So, press the 'Browse' button to search for the new database. Using the folder browser, you can navigate to the folder where you just created the new database. Inside the folder, you will see a file called 'SourceSafe.
This is the database file you need to connect to. Select this file and press 'Open'. This will connect to the new database. Step 3 : Create users After you connect to the new database, you will see the list of available users. There are 2 users created by default:. Delete the Guest user. Go to System Properties window by searching Create a restore point on your computer.
Then, select a drive and click Configure. After disabling system protection, all the system restore points and its volume shadow copy will be deleted. The volume shadow copy can create a snapshot of your computer files or volume, which is very similar to backup, but can volume shadow copy really replace backup? The answer is NO , and it will not work in the following situation. The partition or volumes crashes. In general, the shadow copies are stored in the original partition, so it's damaged when the partition crashes.
The volume shadow copy in Windows has high disk usage. At this time, it will be deleted without any prompt. You want to keep all the changes. The volume shadow copy cannot always keep all the changed files correctly. Well then, what is a backup image and what does it can do for you? Then, let's get started to create a file backup for your files and folders. If you want to backup specific partition, system or disk, please use "Partition Backup", " System Backup " or "Disk Backup" to replace it.
Connect the storage to store files or folders you want to backup, and be sure it can be detected. Click Add File or Add Folder to select files or folders to backup. Click where the arrow point and select a path to save the files and folders. Step 4 Recommended. After that, click Start Backup to start the pending operation.
The default schedule settings are daily backup and incremental backup. The former option is to backup files regularly while the latter one is the guarantee to backup changes after full backup. Please note that incremental backup requires all backups to be intact.
If the backup time is during off-peak hours, you could tick " Wake the computers to scheduled tasks ". Then, it will automatically wake up your computer 2 minutes before the task start.
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