PowerCLI: Export and import customization profiles
Using customization profiles you can automate Virtual Machine deployments. These profiles are normally stored in the vCenter Server database. Arnim has written a few scripts so that you can export and import these profiles into xml files, hereby making the profiles much more portable and easier to backup (and restore).
read more:
http://www.van-lieshout.com/2009/07/export-and-import-customization-profiles-using-powershell/