Hi,
I have a registered sde-database in my ArcGIS Enterprise (10.6.1) and want to publish data from there to my Portal. In ArcGIS Desktop (also 10.6.1), when using the option share as service and choosing My Hosted Services, the analysis still says that the data is being copied to the server.

Weird enough, if I want to publish directly to my server instead of my Portal via My Hosted Services (so via gisserver.domain.com:6443/arcgis), then the analysis doesn't give me this warning. I published via both ways to my portal and it turns out that indeed the data is referenced when I directly publish to my server and is being copied to the server if I publish via My Hosted Services.
I want to be sure the data is not being copied to the server and kept in the database. I would like to publish through portal, but apparently this copies the data to ArcGIS Server. How can I overcome this issue?