You must download updates for the virtual appliances and shut down services on instances of your vRealize Appliance and IaaS servers before you begin the upgrade. Backing up and Saving Your Existing EnvironmentBefore you begin an upgrade process, you complete the backup prerequisites. Shut Down vCloud Automation Center Services on Your IaaS Windows ServerBefore you begin the upgrade, shut down vCloud Automation Center services on your IaaS Windows Server. Prepare a Clustered PostgreSQL Environment for UpgradeIf your high-availability deployment relies on a clustered PostgreSQL server, either embedded or external, you must configure each vRealize Automation appliance node for upgrade. Increase vCenter Server Hardware Resources for UpgradeBefore you proceed with upgrade you must increase hardware resources for each vRealize Appliance. Create a SaaS Schema and Citext Extension for External vRealize Automation DatabaseFor an external PostgreSQL server, you need to manually create a schema called saas and a citext extension for your vRealize Automation database. Downloading Virtual Appliance UpdatesYou can check for updates from the client management page for your appliance and download the updates by using one of several methods.