These are the steps for migrating SharePoint to a new server:
Backup the site using the STSADM utility:
stsadm –o backup –url http://<server name>:<port> -filename <pathfile.bak> -includeusersecurity -nofilecompression
Create a new Web Application for restoring the site:
Go to Central Administration -> Application Management -> under SharePoint Web Application Management -> click Create or Extend
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