You back up licenses to easily restore them if something unexpected happens.
Close all Building Operation applications, such as License Administrator, WorkStation, and Enterprise Server.
On the License Server, browse to the folder:
Windows 7, Windows 8.1, and Windows 10: \ProgramData\FLEXnet
Windows Server 2008 and Windows Server 2012: \ProgramData\FLEXnet
Copy all files in the FLEX-net folder that start with taclic_ and paste the files onto your external backup resource.