EHP4 System copy of the existing SAP system

Hi!
In order to refresh our SAP ERP system with EHP4 we would like to execute a system copy of the existing SAP EHP4 system.
This system should be installed on the existing server.
Question:
Which parts of the software (SAP, Oracle) do I need to delete before or can I rewrite the existing system with the exported EHP4 system?
Any helpful information will be very appreciated!

Hi!
Many thanks for your reply.
> 1. install MCOD
> 2. Drop database and recreate
The second option means the existing system/database will be rewritten by the new database.
I have a double stack system (ABAP + Java Stack, including Portal)
Question
Does this option (Drop database and recreate) suit in my case (SAP system with double stack) or should delete old SAP system before installing the new one with SAPINST via system import?

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