NetBackup documentation links for specific versions (updated)
In the following documentations links, you can find not only the Release Notes, Upgrade Guide for a specific NetBackup™ version but also how to configure Exchange, Sharepoint backup and more as well.
For example, if you want to upgrade NetBackup™ from 7.5 to 7.6, you should follow the link regarding to NetBackup™ 7.6.