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To archive your aud$ table (which locates another tablespace) : http://ulfet.blogspot.com/2013/02/archive-and-purge-aud-table.html
Also you can DBMS_AUDIT_MGMT.SET_AUDIT_TRAIL_LOCATION for moving standart aud$ table`s to another tablespace then disable audit of database and (make tablespace read only which new migrated tablespace) then using skip read only tablespace command via rman you can duplicate your production database.
to move aud$ table`s tablespace to aother tablespace please refer to : http://ulfet.blogspot.com/2012/12/oracle-audit-fine-grained-audit.html