This video shows how to migrate repository from PowerCenter 9.6.1 to 10.2. This includes:
Backup to existing repository in PowerCenter 9.6.1
Disabling the repository service
Creating a repository in PowerCenter 10.2 with the same name and pointing to the same schema as the first step
Copy and paste the siteKey from PowerCenter 9.6.1 to PowerCenter 10.2
Upgrading the repository content
How to automate the repository and domain back up process for disaster recovery in PowerCenter
How to find in which host the Repository Integration service is running in a multi node domain
Converting and adding of a self signed certificate to use a Webservice Consumer transformation