I think you may have made a typo error:
"what is difference between PBBA 5230 & PBBA 5230".
Maybe you meant 5230 and 5240?
The NBU Appliances is a master and/or media server with local storage all in one. It supports all the latest dedupe technology, like source and target dedupe, accelerator, etc.
Lots of documentation about NBU Appliances over here:
https://www.veritas.com/product/backup-and-recovery/netbackup-appliances/resources
In short - the 5240 is the latest generation of NBU Appliances, replacing the 5230.
It is faster, smaller footprint, more energy efficient, etc.
The Hitachi Appliance is a 3rd-party backup appliance that still needs media servers and can only perform target dedupe.
You can also read the last 2 replies in this post as both are 3rd-party OST appliances:
https://vox.veritas.com/t5/NetBackup-Appliance/Dell-DR-600-appliance-integration-with-Netbackup/m-p/...
The features supported by each type of dedupe appliance can be found in the HCL (see the post that I have mentioned above for URL).
