Backing up Particular Datafile and System file:
RMAN> run
{
allocate channel c1 type disk;
copy
datafile 1 to 'C:\oracle\product\10.2.0\flash_recovery_area\DBA20\Image copy\SYSTEM01.DBF',
current controlfile to 'C:\oracle\product\10.2.0\flash_recovery_area\DBA20\Image copy\CONTROL01.ctl';
}
Backup Database:
RMAN> backup as copy database;
Compressed Backup:
RMAN> backup as compressed backupset database;
RMAN> configure device type disk backup type to compressed backupset;