You cannot back up an Exchange Server 2007 server CCR node after you install Exchange Server 2007 CCR Service Pack 2 on the CCR node

#
# THIS CODE IS MADE AVAILABLE AS IS, WITHOUT WARRANTY OF ANY KIND. THE ENTIRE RISK
# OF THE USE OR THE RESULTS FROM THE USE OF THIS CODE REMAINS WITH THE USER.
#
# Synopsis: This script is to be used to help register and unregister
#           the WSBPlugin for Exchange 2007

# Define the script parameters
param([switch] $Register   = $false,
      [switch] $UnRegister = $false);

# Define global variables
$script:WsbBinPath = "";
$script:reg= join-path (join-path $env:SystemRoot system32) reg.exe;
$script:servicecmd = join-path (join-path $env:SystemRoot system32) sc.exe;
$script:InstallPath

# This function will Register the WSB extension for Exchange backup/restore
function Register-WSBExchange
{	
    if ([Environment]::OSVersion.Version.Major -ge 6)
    {      	
    	if ((get-service wsbexchange* | where {$_.name -eq "wsbexchange"}))
    	{
    	      if ((get-service wsbexchange).Status -eq "Running")
    	      {
    	          Start-SetupProcess -Name:"$servicecmd" -Args:"stop wsbexchange";
    	      }
    	      Start-SetupProcess -Name:"$servicecmd" -Args:"delete wsbexchange";
    	}
    	
    	Start-SetupProcess -Name:"$reg" -Args:"add `"HKCR\CLSID\{D8A2E312-3B17-4293-B71E-CD72A7C04BF3}`" /t REG_SZ /d  `"CExchangeHelper Class`" /f";
    	Start-SetupProcess -Name:"$reg" -Args:"add `"HKCR\CLSID\{D8A2E312-3B17-4293-B71E-CD72A7C04BF3}`" /v AppId /t REG_SZ /d `"{D8A2E312-3B17-4293-B71E-CD72A7C04BF3}`" /f";
    	Start-SetupProcess -Name:"$reg" -Args:"add `"HKCR\CLSID\{D8A2E312-3B17-4293-B71E-CD72A7C04BF3}\LocalServer32`" /t REG_SZ /d `"$WsbBinPath`" /f";
    	Start-SetupProcess -Name:"$reg" -Args:"add `"HKCR\APPID\{D8A2E312-3B17-4293-B71E-CD72A7C04BF3}`" /t REG_SZ /d `"CExchangeHelper Class`" /f";
    	Start-SetupProcess -Name:"$reg" -Args:"add `"HKCR\APPID\{D8A2E312-3B17-4293-B71E-CD72A7C04BF3}`" /v LocalService /t REG_SZ /d `"wsbexchange`" /f";
    	Start-SetupProcess -Name:"$reg" -Args:"add `"HKCR\APPID\{D8A2E312-3B17-4293-B71E-CD72A7C04BF3}`" /v LaunchPermission /t REG_BINARY /d `"010004806000000070000000000000001400000002004c0003000000000014001f000000010100000000000512000000000018001f000000010200000000000520000000200200000000180003000000010200000000000520000000270200000102000000000005200000002002000001020000000000052000000020020000`" /f";
    	Start-SetupProcess -Name:"$reg" -Args:"add `"HKCR\APPID\wsbexchange.exe`" /v AppId /t REG_SZ /d `"{D8A2E312-3B17-4293-B71E-CD72A7C04BF3}`" /f";    	
    	Start-SetupProcess -Name:"$reg" -Args:"add `"HKLM\Software\Microsoft\windows nt\currentversion\WindowsServerBackup\Application Support\{76fe1ac4-15f7-4bcd-987e-8e1acb462fb7}`"  /v `"Application Identifier`" /t REG_SZ /d Exchange /f";
    	Start-SetupProcess -Name:"$reg" -Args:"add `"HKLM\Software\Microsoft\windows nt\currentversion\WindowsServerBackup\Application Support\{76fe1ac4-15f7-4bcd-987e-8e1acb462fb7}`" /v CLSID /t REG_SZ /d `"{D8A2E312-3B17-4293-B71E-CD72A7C04BF3}`" /f";    	
    	Start-SetupProcess -Name:"$reg" -Args:"add `"HKLM\Software\Microsoft\windows nt\currentversion\WSBAppExchangeHelper`" /v AutoMarkDbRecoverable /t REG_DWORD /d 1 /f";
    	Start-SetupProcess -Name:"$reg" -Args:"add `"HKLM\Software\Microsoft\windows nt\currentversion\WSBAppExchangeHelper`" /v AutoMountOnPITRecovery /t REG_DWORD /d 1 /f";

    	Start-SetupProcess -Name:"$servicecmd" -Args:"create wsbexchange binpath= `"$WsbBinPath`" type= own start= demand error= ignore obj= LocalSystem DisplayName= `"Microsoft Exchange Server Extension for Windows Server Backup`"";
    	Start-SetupProcess -Name:"$servicecmd" -Args:"description wsbexchange `"Enables Windows Server Backup users to back up and recover application data for Microsoft Exchange Server.`"";
    }
}

# This function will UnRegister the WSB extension for Exchange backup/restore
function UnRegister-WSBExchange
{
    if ([Environment]::OSVersion.Version.Major -ge 6)
    {
                  
    	if ((get-service wsbexchange* | where {$_.name -eq "wsbexchange"}))
    	{
    	  if ((get-service wsbexchange).Status -eq "Running")
    	  {
    	      Start-SetupProcess -Name:"$servicecmd" -Args:"stop wsbexchange";
    	  }
          
    	  Start-SetupProcess -Name:"$servicecmd" -Args:"delete wsbexchange";
          
    	  Start-SetupProcess -Name:"$reg" -Args:"delete `"HKCR\CLSID\{D8A2E312-3B17-4293-B71E-CD72A7C04BF3}`" /f";
    	  Start-SetupProcess -Name:"$reg" -Args:"delete `"HKCR\APPID\{D8A2E312-3B17-4293-B71E-CD72A7C04BF3}`" /f";
    	  Start-SetupProcess -Name:"$reg" -Args:"delete `"HKCR\APPID\wsbexchange.exe`" /f";
    	  Start-SetupProcess -Name:"$reg" -Args:"delete `"HKLM\Software\Microsoft\windows nt\currentversion\WindowsServerBackup\Application Support\{76fe1ac4-15f7-4bcd-987e-8e1acb462fb7}`" /f"; 
    	  Start-SetupProcess -Name:"$reg" -Args:"delete `"HKLM\Software\Microsoft\windows nt\currentversion\WSBAppExchangeHelper`" /f";
    	}
    }
}

# This funciton will validate the script parameters
function Validate-Parameters
{
  $validParams = $true;
  $errorString =  "`n`n################################################################################`n"
  $errorString += "# There were errors validating the script parameters!                          #`n"
  $errorString += "################################################################################`n"
  
  if (!$Register -and !$UnRegister)
  {
    # User specified neither the Register or UnRegister action
    $validParams = $false;
    $errorString += "`nERROR: You must specify either the `"Register`" or `"UnRegister`" action.`n"
  }
  
  if ($Register -and $UnRegister)
  {
    # User specified both the Register and UnRegister actions
    $validParams = $false;
    $errorString += "`nERROR: You can only specify either the `"Register`" or `"UnRegister`" action, but not both.`n"
  }
  
  if (!$validParams)
  {
    $errorString += "`n`nUse -? to see the usage of the script.`n"
    Write-Warning "$errorString`n`n"
  }
  else
  {
    # Get the FQDN for this server
    $ipGlobalProperties = [System.Net.NetworkInformation.IPGlobalProperties]::GetIPGlobalProperties();

    # Get Exchange setup path
    $Reg_ExSetup = "SOFTWARE\\Microsoft\\Exchange\\Setup"
    $SetupPathVALUE = "MsiInstallPath"
     
	# Open remote registry
	$registry = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey('LocalMachine', $ipGlobalProperties.HostName);
 
	# Set regKey for MsiInstallPath
	$regKey= $registry.OpenSubKey($REG_ExSetup)
 
	# Get Install Path from Registry and replace : with $
	$script:InstallPath = $regkey.getvalue($SetupPathVALUE)
 
	# Set WSBExchange.exe path
	$binFile = "Bin\wsbexchange.exe"
    $script:WsbBinPath = [System.IO.Path]::Combine($installPath, $binFile);
  }
    
  return $validParams;
}

function Usage
{
@"
********************************************************************************

SUMMARY:

This script assists in the registration of WSB extension for Exchange 2007 
database backup restore plugin. 

********************************************************************************

USAGE:

Register-WSBExchange.ps1 <-Register | -UnRegister> [-ExchangeBinPath]

-Register`tRegister WSBExchange.

-UnRegister`tRemove WSBExchange.

********************************************************************************

"@
}

####################################################################################################
# Script starts here
####################################################################################################

# Check for Usage Statement Request
if (($args.Count -gt 0) -and ($args[0] -imatch "-{1,2}[?h]"))
{
  # User wants the Usage Statement
  Usage
  return
}

# Check if user specified either the Register or UnRegister switches
if (Validate-Parameters)
{
  # Change to the bin directory where Exchange was installed.
  pushd $InstallPath;
  
  # Simply add necessary cmdlet  
  Remove-PSSnapin "Microsoft.Exchange.Management.PowerShell.Admin"
  Add-PSSnapin "Microsoft.Exchange.Management.PowerShell.Setup"
 
  if ($Register)
  {
    Write-Host "Now installing WSBExchange...";
    Register-WSBExchange
  }
  elseif ($UnRegister)
  {
    Write-Host "Now uninstalling WSBExchange...";
    UnRegister-WSBExchange
  }
  
  # Restore Exchange Powershell snapin
  Remove-PSSnapin "Microsoft.Exchange.Management.PowerShell.Setup"
  Add-PSSnapin "Microsoft.Exchange.Management.PowerShell.Admin"
}