Hi puma95,
I've been using NetBackup for six years, and I thoroughly recommend it. It scales so well, from a single small standalone local installation on a single business server - all the way up to thousands of clients. It is very capable of growing with your business, and whenever you have a stragetic refresh you can nearly always retain/reuse your entire existing infrastructure.
Some initial questions:
1) Do you have your business requirements well defined? Without this, you will be at sea no matter which product you look at. This is an absolute minimum pre-cursor.
2) Do you have I.T. requirements? e.g. RTOs (Recovery Time Objective) are usually fairly easy to define, and RPOs (Recovery Point Objective) for each system, but these are usually harder to define.
3) Is there anything already in place that can leveraged?
4) Or is this a green-field installation?
5) How much data do you expect to backup? Daily, Weekly?
6) How long do you intend to retain your copies of data for?
6) How many servers do you expect to backup?
7) What is the mix of platforms and O/S variants/versions? Any really old servers?
8) How many sites, buildings, plants, offices?
9) Is this part of a cohesive DR plan?
10) Do you have part of your budget reserved for professional services from a reseller - or at least one or more experienced contractors to help you get setup quickly?
IMHO, the questions above will help you determine which hardware you need, and then, I think you'll be pleasantly surprised that NetBackup more than likely supports any and all of it.
These pages will be most useful for you initially:
Symantec's overview of NetBackup:
http://www.symantec.com/business/products/newfeatures.jsp?pcid=2241&pvid=2_1
Sun's overview of NetBackup:
http://www.sun.com/storage/management_software/data_protection/veritas_netbackup/features.xml
The Backup Planning and Performance Tuning Guide for v6.5:
ftp://exftpp.symantec.com/pub/support/products/NetBackup_Enterprise_Server/307083.pdf
The NetBackup support/docs/manuals etc front page:
http://www.symantec.com/business/support/overview.jsp?pid=15143
These pages will be useful once you have decided to purchase:
The support case logging site:
https://mysupport.symantec.com/
The 45-day digest of issues:
http://seer.support.veritas.com/docs/NBUESVR_digest.htm
(N.B. do not be put off by this. This is probably one of the most useful sites, once you get set-up. Symantec are very good indeed at keeping customers informed via this page/site).
The Licencing Portal:
https://licensing.symantec.com/acctmgmt/index.jsp
HTH,
Dave.