Edit C:\Windows\PolicyDefinitions\WindowsBackup.admx

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

<policyDefinitions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" revision="1.0" schemaVersion="1.0" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
  <policyNamespaces>
    <target prefix="windowsbackup" namespace="Microsoft.Policies.WindowsBackup" />
    <using prefix="backup" namespace="Microsoft.Policies.Backup" />
    <using prefix="windows" namespace="Microsoft.Policies.Windows" />
    <using prefix="server" namespace="Microsoft.Policies.Server" />
  </policyNamespaces>
  <resources minRequiredRevision="1.0" />
  <categories>
    <category name="Backup" displayName="$(string.Backup)">
      <parentCategory ref="windows:WindowsComponents" />
    </category>
    <category name="BackupServer" displayName="$(string.BackupServer)">
      <parentCategory ref="backup:Backup" />
    </category>
  </categories>
  <policies>
    <policy name="AllowOnlySystemBackup" class="Machine" displayName="$(string.AllowOnlySystemBackup)" explainText="$(string.AllowOnlySystemBackupExplain)" key="Software\Policies\Microsoft\Windows\Backup\Server" valueName="OnlySystemBackup">
      <parentCategory ref="BackupServer" />
      <supportedOn ref="server:SUPPORTED_WindowsServer2008" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
    </policy>
    <policy name="DisallowLocallyAttachedStorageAsBackupTarget" class="Machine" displayName="$(string.DisallowLocallyAttachedStorageAsBackupTarget)" explainText="$(string.DisallowLocallyAttachedStorageAsBackupTargetExplain)" key="Software\Policies\Microsoft\Windows\Backup\Server" valueName="NoBackupToDisk">
      <parentCategory ref="BackupServer" />
      <supportedOn ref="server:SUPPORTED_WindowsServer2008" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
    </policy>
    <policy name="DisallowNetworkAsBackupTarget" class="Machine" displayName="$(string.DisallowNetworkAsBackupTarget)" explainText="$(string.DisallowNetworkAsBackupTargetExplain)" key="Software\Policies\Microsoft\Windows\Backup\Server" valueName="NoBackupToNetwork">
      <parentCategory ref="BackupServer" />
      <supportedOn ref="server:SUPPORTED_WindowsServer2008" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
    </policy>
    <policy name="DisallowOpticalMediaAsBackupTarget" class="Machine" displayName="$(string.DisallowOpticalMediaAsBackupTarget)" explainText="$(string.DisallowOpticalMediaAsBackupTargetExplain)" key="Software\Policies\Microsoft\Windows\Backup\Server" valueName="NoBackupToOptical">
      <parentCategory ref="BackupServer" />
      <supportedOn ref="server:SUPPORTED_WindowsServer2008" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
    </policy>
    <policy name="DisallowRunOnceBackups" class="Machine" displayName="$(string.DisallowRunOnceBackups)" explainText="$(string.DisallowRunOnceBackupsexplain)" key="Software\Policies\Microsoft\Windows\Backup\Server" valueName="NoRunNowBackup">
      <parentCategory ref="BackupServer" />
      <supportedOn ref="server:SUPPORTED_WindowsServer2008" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
    </policy>
  </policies>
</policyDefinitions>

Ms-Dos/Windows Unix Write backup

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