This is the backup script in use; I paste the contents here, as I could't attache the file, don't why.
excuse me for any inconvenience may cause.
#!/bin/sh
#bcpyrght
#***************************************************************************
#* $VRTScprght: Copyright 1993 - 2012 Symantec Corporation, All Rights Reserved $ *
#***************************************************************************
#ecpyrght
#
# These environment variables are initialized by Netbackup (bphdb)
#
echo "DB2_CLIENT = $DB2_CLIENT"
echo "DB2_SERVER = $DB2_SERVER"
echo "DB2_POLICY = $DB2_POLICY"
echo "DB2_SCHED = $DB2_SCHED"
echo "DB2_FULL = $DB2_FULL" # Is 1 if Full backup scheduled
echo "DB2_CINC = $DB2_CINC" # Is 1 if Cumulative incremental scheduled
echo "DB2_INCR = $DB2_INCR" # Is 1 if Differential incremental scheduled
#
# Change MY_LIB to the correct NetBackup library name for your host:
# Solaris or Linux 32-bit = nbdb2.so
# Solaris 64-bit = nbdb2.so64
# HPUX (ia64) = nbdb2.so
# AIX or HPUX = nbdb2.sl
# AIX or HPUX = nbdb2.sl64
#
MY_LIB=/usr/openv/netbackup/bin/nbdb2.so64
#
# Change MY_DB2 to the correct DB2 instance name for your database.
#
MY_DB2=XXXXXX_DB
#
# Use the NetBackup schedule type to set DB2 full or incremental options.
#
if [ "$DB2_FULL" = "1" ] ; then
MY_SCHED=""
elif [ "$DB2_CINC" = "1" ] ; then
MY_SCHED="INCREMENTAL"
elif [ "$DB2_INCR" = "1" ] ; then
MY_SCHED="INCREMENTAL DELTA"
else
MY_SCHED=""
fi
#
# Initialize the backup command line.
# Customize the number of sessions and buffer options for your environment.
#
#CMD_LINE="db2 BACKUP DATABASE $MY_DB2 $MY_SCHED LOAD $MY_LIB OPEN 4 SESSIONS BUFFER 1024"
CMD_LINE="db2 BACKUP DATABASE $MY_DB2 online $MY_SCHED LOAD $MY_LIB OPEN 4 SESSIONS BUFFER 1024 include logs"
#
# Change MY_USER to the proper DB2 user for performing backups
#
MY_USER=db2inst1
echo "Executing: $CMD_LINE"
su - $MY_USER -c "$CMD_LINE"
RETURN_STATUS=$?
# Return 0 for success, non-zero for errors
exit $RETURN_STATUS
