Increasing the security level
By default, NetBackup appliances offer a hardened environment for protecting your infrastructure. Lockdown mode adds unique protection from credential compromise with its built-in One Time Password (OTP) mechanism, which prevents unauthorized access to the operating system.
NetBackup uses access codes for a similar purpose, to prevent unauthorized access to commands.
How to enable lockdown mode or access codes:
Flex Appliance
NetBackup Appliance
See Disable user access to the NetBackup appliance operating system.
NetBackup
See Access codes.