Huge size of /usr folder on backup server

I have a query related to the size of /usr folder on backup server.
Please see the following logs.

bash-3.2# pwd
/
bash-3.2# du -sh * | grep G
1.1G opt
11G proc
2.0G storage_db
12G usr
3.0G var

Note the size of /usr directory.

Now check inside /usr
bash-3.2# du -sh * | grep G
8.7G openv

Now check inside openv
bash-3.2# du -sh * | grep G
4.0G db
1.9G netbackup
2.0G pack

And now inside db
bash-3.2# du -sh * | grep G
2.0G data
1.9G staging

Inside data
bash-3.2# ls -ltr
total 4099338
rw------ 1 root bin 2433024 Sep 16 2012 NBAZDB.db.template
rw------ 1 root root 0 Feb 24 2014 vxdbms_conf.lock
rw------ 1 root root 26218496 Feb 24 2014 DARS_INDEX.db
rw------ 1 root root 26218496 Feb 24 2014 DARS_DATA.db
rw------ 1 root root 26218496 Feb 24 2014 SEARCH_INDEX.db
rw------ 1 root root 26218496 Feb 24 2014 SEARCH_DATA.db
rw------ 1 root root 26218496 Dec 12 01:00 BMR_INDEX.db
rw------ 1 root root 617 Apr 7 02:01 vxdbms.conf
rw------ 1 root root 2441216 Apr 7 23:54 NBAZDB.db
rw------ 1 root root 4096 Apr 7 23:54 NBAZDB.log
rw------ 1 root root 26218496 Apr 8 00:01 EMM_INDEX.db
rw------ 1 root root 1071763456 Apr 8 00:05 EMM_DATA.db
rw------ 1 root root 26218496 Apr 8 00:05 DBM_DATA.db
rw------ 1 root root 26218496 Apr 8 00:05 DBM_INDEX.db
rw------ 1 root root 26218496 Apr 8 00:05 JOBD_DATA.db
rw------ 1 root root 1376256 Apr 8 00:06 BMRDB.log
rw------ 1 root root 3588096 Apr 8 00:06 NBDB.db
rw------ 1 root root 5836800 Apr 8 00:06 BMRDB.db
rw------ 1 root root 773881856 Apr 8 00:06 BMR_DATA.db
rw------ 1 root root 327680 Apr 8 00:06 NBDB.log

Queries:
Why the size of following folders is keep on growing
/usr/openv/pack
/usr/openv/db/staging
/usr/openv/db/data
Is there any truncation procedure.

System is already at 90% and since the above folders are growing it will reach 100% eventually.
What are the recommendations on it from Symantec.