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An excellent way to protect your shared folders is by using shadow copies. Shadow copies allow an administrator to back up shared folders to a remote location. Shadow copies are designed to help recover files that were accidentally deleted, were overwritten, or have become corrupt. One major advantage to shadow copies is that open files can be backed up. This means that even if users are currently working on files in a shared folder that has shadow copies enabled, the shadow copies will continue to function.
Once administrators have configured and enabled shadow copies (using the Computer Management snap-in), network users can restore earlier versions of files. After the initial shadow copy of the shared folder is created, only changes are copied and not the entire file.