NetBackup backup copies integrity and security

Colleagues,

Have you ever been thinking about backup copies security? I am talking about two aspects:

1. Unauthorised access to backup copies
2. Backup copies files integrity

These are two problems that IT could possibly face.

Do you have an idea how to ensure that backup copies remain unmodified and avoid anouthorized access to backup files?

Does NetBackup has embedded functionality to solve these problems? If not - what solution will fit here?