Performing an In-Place Upgrade of Reporting Services
If you’ve run the Upgrade Advisor and it doesn’t report any issues that would prevent a successful upgrade (or you’ve addressed any issues it raises), you can perform an in-place upgrade of any instance of SQL Server 2005 SP4 Reporting Services, SQL Server 2008 SP2 Reporting Services, or SQL Server 2008 R2 SP1 Reporting Services.
Before upgrading Reporting Services, you should first back up the following:
The symmetric key (by using the RSKEYMGMT tool)
Your Report Server databases
Configuration ...
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