You copy a system to create a duplicate of an existing system with a different host
name and a unique system ID. SAP Landscape Management creates a copy of the
existing system and renames the copy.
You refresh a database to keep the configuration settings of your application
instances such as central instance (CI), dialog instance (DI), and so on.
You perform a restore based refresh for a system with SAP HANA databases using a
complete database backup from the source system. With that you refresh the SAP HANA database of the system
but keep the configuration settings of your application instances such as central instance
(CI), dialog instance (DI), and so on.
You execute post-copy automation (PCA) standalone to carry out several configuration
steps on a system that was not provisioned by SAP Landscape Management.