o First, create directory expdir (If you don't specify the parameter DIRECTORY=xxx then the dump file will dumped to /home/oracle/app/oracle/admin/$ORACLE_SID/dpdump by default)
SQL> CONNECT system/welcome1
SQL> CREATE OR REPLACE DIRECTORY expdir AS '/home/exp_data';
SQL> GRANT READ,WRITE ON DIRECTORY expdir TO PUBLIC;
o Then use expdp
$ORACLE_HOME/bin/expdp system/welcome1@orcl DUMPFILE=data_bak.dmp DIRECTORY=expdir VERSION=10.2 SCHEMAS=SCOTT
o Then you can copy the /home/exp_data/data_bak.dmp to some other directory or some other machine to backup it.
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o First, create directory expdir (if you already created it, plz ignore this step)
o Then delete the SCOTT schema (beware of this step !!!)
SQL> CONNECT system/welcome1
SQL> DROP USER SCOTT CASCADE;
o Then use impdp
$ORACLE_HOME/bin/impdp system/welcome1 DIRECTORY=expdir DUMPFILE=data_bak.dmp PARTITION_OPTIONS=MERGE remap_schema=SCOTT:NEWSCHEMA