If database dbName has non-default SecurityDatabase parameter in databases.conf the following call results in an error:
# gbak -se host:service_mgr -par 2 -b -g -m -user SYSDBA -pass masterkey dbName /dir/Backup_Name.fbk
gbak: ERROR:Missing security context for clxProdukt_prod
gbak:Exiting before completion due to errors
At the same time:
# gbak -se host:service_mgr -b -g -m -user SYSDBA -pass masterkey dbName /dir/Backup_Name.fbk -par 2
works OK.