I fresh install new server nextcloud already, I config everything is same old server nextcloud, I need to transfer only one user data from old server nextcloud to new server nextcloud, Is it possible ?
The old server use Server-side encryption, I don’t know effect or not.
It is not possible, only so much as you are able to manually export and import the data within each specific app. You’ll need to do a full restore of the previous instance’s database. I cannot speak to the restoration of server side encryption keys, but check nextcloud admin documentation or github for specifics.