Backup and restore IIS7.5 from Server A(Windows Server 2008 R2) to Server B(Windows Server 2008 R2)

The thing is that I want to "Export Server or Site Package" from a source server, and then "Import Server or Site Package" to destination server. After I installed Web Deploy 3.5 both on source server and destination server. Then I "Export Server or Site Package" and "Import Server or Site Package" successfully.

And then I imported RSA Keys, and they all succeeded.

But once I typed the url in the browser, it occurs HTTP Error 503.(Service Unavailable)

I referenced this link(because "The Module DLL C:\Windows\system32\inetsrv\rewrite.dll failed to load. The data is the error. also appears in my Windows Event Viewer"):

http://blog.miniasp.com/post/2014/05/13/Service-Unavailable-in-IIS7-IIS8-with-32-bit-application-pool.aspx

I installed IIS URL Rewrite Module 2, but I can't modify the applicationHost.config file(once I modified it, it will occur "C:\Windows\system32\inetsrv\config\applicationHost.config Configuration file is not well-formed XML")

So I only deleted the RewriteModule in sites by using IIS Manager following the link above.

But once I typed url again in the browser, the error message in Windows Event Viewer becomes "warmup.dll failed to load. The data is the error". Then I copied the warmup.dll from the source server to destination server. But the problem HTTP Error 503.(Service Unavailable) still exists.

Can anyone help me? Thanks!