Right now, im using alfresco 2.1 to manage a portal. If in the future I want to change to 2.2. It could be possible that the current data won´t be valid for the next version. Is there or is going to exists any kind of document,script, tool or whatever in order to migrate among different versions??
Alfresco features auto-upgrade of data between full releases. So stopping the server and overwriting the alfresco WAR file with a newer version and restarting the server will upgrade the system data. Always backup first!