Hi Christian ,
Hope you are doing good.
Just to let you know that this activity is not supported by SAP Image may be NSFW.
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and hence no official notes are there for this.
Apart from the steps that you mentioned, also go through SAP Note
| > 11692 - Renaming the system ID; |
(is not about instance, but SID, but it will give you a good idea).
You can refer to the following link for the guides to perform the copy:
-> http://service.sap.com/instguides
Hope this helps.
Thank you and have a nice day!
_____________
Kind Regards,
Hemanth
