Edit C:\Windows\PolicyDefinitions\FileServerVSSProvider.admx

??<?xml version="1.0" encoding="utf-8"?>

<policyDefinitions xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                   revision="1.2" schemaVersion="1.0" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
  <policyNamespaces>
    <target prefix="Provider" namespace="Microsoft.Policies.FileShareShadowCopy.Provider" />
    <using prefix="windows" namespace="Microsoft.Policies.Windows" />
    <using prefix="products" namespace="Microsoft.Policies.Products" /> 
  </policyNamespaces>
  <resources minRequiredRevision="1.2" />
  <categories>
    <category name="Cat_FileShareShadowCopyProvider" displayName="$(string.Cat_FileShareShadowCopyProvider)">
      <parentCategory ref="windows:System" />
    </category>
  </categories>
  <policies>
    <policy name="Pol_EncryptProtocol" class="Machine" displayName="$(string.Pol_EncryptProtocol)" explainText="$(string.Pol_EncryptProtocol_Help)" key="Software\Policies\Microsoft\Windows\fssProv" valueName="EncryptProtocol">
      <parentCategory ref="Cat_FileShareShadowCopyProvider" />
      <supportedOn ref="windows:SUPPORTED_Windows8" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
    </policy>    
  </policies>
</policyDefinitions>

Ms-Dos/Windows Unix Write backup

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