Informatica does not allow to backup the repository and restore directly into a higher environment as the repository version changes across major versions. This video demonstrates the migration of Repository Service from a lower version to a higher version of PowerCenter.
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