incomplete sysaux expdp unload (ORACLE) my question is really simple, and does not need any particular documentation.
When I run expdp command like this using Oracle Database 11g Release 11.2.0.4.0 - 64bit:

expdp system/******* directory=DATA_PUMP_DIR dumpfile=SYSAUX.dmp logfile=sysaux.log TABLESPACES=SYSAUX


I see that no table about SYSTEM schema is present.
I know for sure that tables in SYSTEM schema belong to SYSAUX tablespace, like DBA_SEGMENTS and DBA_EXTENTS tell me, but I don't see any log row like this:

.. exported "SYSTEM"."TABLENAME"                       120.2 GB 8396874 rows


No error message with expdp, just missing tables.....
Could anyone please give me suggestions about this?
Actually SYS.AUD$ table CAN be exported but only using old export command exp instead of expdp.

exp \"/ as sysdba\" file=aud_table.dmp tables=sys.aud$;


Since 11g or 10 (not sure) AUD$ table is prohibited to be exported.

The most convenient way is what @Balazs Papp suggested, to create table AUD$_BACKUP as select * from SYS.AUD$