To configure immutability using GUI

1. Go to Settings > Security management > Immutability. Click Edit.
   
2. Choose any of the lockdown modes under Mode Selection. You can choose from Normal, Enterprise, and Compliance. The supported features for each mode are listed.

   Note:

   You cannot downgrade the lockdown mode after it is configured. For example, if the lockdown mode is set to compliance, you cannot change the lockdown mode to enterprise or normal.

3. If you choose Enterprise or Compliance mode, you also have to configure the retention time range from which the NetBackup administrators will be allowed to select when creating backup images. Specify the maximum and minimum retention time. Click Save.

   Note:

   Ensure that the image retention period in backup policies is within the lockdown mode retention time to avoid any error during backup.