A very common challenge developer and administrator face when they have to migrate content between SQL Server Reporting Server. This is because SQL Server Reporting Services (SSRS) currently doesn’t include a feature for migrating content items and settings from one Reporting Services report server to another report server. There are two different methods to do overcome this challenge. 1) Create RSS scripts that are used by rs.exe to migrate the content of Reporting Services, between reports servers of the same mode or different modes. 2) Run Reporting Services Migration Tool to migrate the content from a Native mode report server to a SharePoint mode report server.
The white paper discusses the Reporting Services Migration tool and various aspects of method of migration like the location of the tool, supportability of the tool, a list of contents migrated by the tool, migration steps and known issues with the tool. You can download the tool from here.
Reference: Pinal Dave (http://blog.SQLAuthority.com)