To migrate a Report Server we would backup ReportServer and ReportServerTempDB, drop the new default databases and restore the old databases on the new server . . .
The first more or less large migration of databases happened in November. I was still inexperienced so of course lots of mistakes happened but besides . . .
End of September I changed from IT Support to Database Administration. My company was migrating thousands of databases from Microsoft SQL 2008/ 2012 to 2016 . . .