netbackup licensing requirement

Netbackup has 2 licensing models

1) capacity based model

2)traditional model 

capacity based model work based on the amount of data(one full backup) that you are planing to take , does not matter what feature that you are using, it will support.

traditional model  work based on the features that you are planning use and license will be provided for each freature.

i would suggest you to reach out the local seller or lincecing team to understand it and see which modle will come for less cost.

http://www.symantec.com/netbackup/renewals-upgrades-licensing/

so if you choose transitional model, you need:

for production

1 NetBackup enterprise server license
2 library tape drive license
2 client license
2 database license

for DR

1 NetBackup enterprise server licenses
2 library tape drive license
2 client license
2 database license, if you will perform oracle backups at the DR

You can change the NetBackup enterprise server licenses with NetBackup server licenses (cheaper option ).

But, you really have to talk with a local seller or symantec presales, as RamNagalla mentioned,  to get accurate prices as there are other factors that affect prizes.