What will happen If we restore SSRS databases i.e. ReportServer and ReportServertempdb from a backup of another SSRS databases? Cheers Sunil Gure

Do you have the encryption key? For 2005 you would have to go through Report Server Configuration manager and set it back up to use. If you do not have the encryption key, then all datasources will be gone and subscription information will also be lost.

What will happen If we restore SSRS databases i.e. ReportServer and ReportServertempdb from a backup of another SSRS databases? Cheers Sunil Gure To answer your question, all the content(users, reports, security, subscriptions etc) in your existing server will be replaced by the information you have in the database you are restoring from. Hope that helps.