NBU7.6.4 Recovery Options

Hi,

We are moving to upgrading from netbackup 6.5 to 7.6.4.

As we have backups with 3 months retention period, i am thinking if we can still recover even after upgrading from 6.5 to 7.4.

Here are the facts:

1. New server with NBU master and media on 7.6.4 (different network backup LAN)

2. Clients with NBU client 6.5 will be uninstalled and installed with NBU 7.6.x. (is this recommended or can direct upgrade??)

3. Old NBU master and media will be retained until backups expires (3-6 months)

4. How can we do a restore from OLD NBU?

5. We are using RMAN backup with NBU, what is the recommended approach when we need to restore from old backup?

Thanks in advance.