This is to describe what is actually being exported and what is not.
"XPSExport -xc" will export most of the configuration on the Policy Server machine.
It exports the requested Policy Store data (depending on whether you use -xb or other switches).
It exports most of the registry data.
But it does not export complete configurations.
So if the export is imported in a new environment, following may not match.
1. Policy Server profiler setting (it only exports the filepath to the smtracedefault.txt file but not its content)
2. ODBC DSN/system_odbc.ini (it only exports the DSN "name" but the actual ODBC Data Source or the system_odbc.ini file is not included)
3. Certificatedb (cert9.db and its paired files).
4. RSA configuration files.
5. EncryptionKey.txt
6. JVMOptions.txt
So if the purpose is to setup a new Policy Server with exact same settings, you will need to get all above mentioned files/configurations and the registry export.
If there are custom code then you will also need to make sure those dependent files are also copied over to the new policy server environment.