Hello Raj,
You may refer to the IBM info center for the detailed backup syntax.
http://publib.boulder.ibm.com/infocenter/db2luw/v8/index.jsp?topic=/com.ibm.db2.udb.doc/core/r0001933.htm
Btw, currently SAP supported Version is 8.2 FP 18. See:
101809 - DB6: Supported Versions and Fix Pack Levels
Kind regards
Maria