log in as sys
create a directory object pointing to the direktory where the backup set is to be created
Create directory expdp_dir as 'C:\Oracle\backupset';
grant the nessecary priviliges to the system user
Grant read,write on directory expdp_dir to system;
finally from the command prompt
expdp system/manager DIRECTORY=expdp_dir DUMPFILE=expfull_DB.dmp FULL=y LOGFILE=expfull_DB.log
thats it!, two files expfull_DB.dmp and expfull_DB.log in the c:\oracle\backupset directory.
if you only want to backup a schema then use the following from the command prompt
C:\>expdp scott/toger DIRECTORY=expdp_dir DUMPFILE=scott_exp.dmp SCHEMAS=scott LOGFILE=scott_imp.log
Importing a backup set i equally simple
from the command prompt
impdp system/manager DIRECTORY=expdp_dir DUMPFILE=expfull_DB.dmp FULL=y LOGFILE=impfull_DB.log
and for a single schema
impdp scott/tiger DIRECTORY=expdp_dir DUMPFILE=scott_exp.dmp
SCHEMAS=scott LOGFILE=scott_imp.log