After moving a Team Project Collection from one TFS server to another, all my workitems, source code, … were available. But I still had to move the Reporting Services reports. As I couldn’t find a Microsoft way to solve this scenario, I looked for some custom tooling to get the job done.
And I found this great Reporting Services Scripter. It allows you to move RDL file from one Reporting Services instance to another. Make sure you check out the different options because I had to change some configuration settings before everything worked.