I couldn't find any documentation on this. I'm currently doing a dry run of SSRS 2005 to SSRS 2008 R2 upgrade/migration. I've backed everything up (encryption key and configuration files) and did a native backup then restore on the new server.
As it's restoring, I see "Converting database 'ReportServer' from version 611 to the current version 661.
Does this mean the server is doing all the heavy lifting of the upgrade in the background. After the restore, I am able to bring the service up and going rather quickly. Is this "upgrade" documented anywhere?