The following thread has details
http://www.dbforums.com/t1000341.html
But, since you are on V4, you can apply the following technique :
db2 backup database sample to /dbbackup,/dbbackup,/dbbackup
will write the backup into three different files ... For 110, I'll use atleast 3 and preferably 4 ... Hence, you are unlikely to hit the 64 Gig limit
HTH
Sathyaram