Ok, thank you for the explanation, I understand now.
First I also did a mistake with the So6. I expected after a import of a project, that the workspace is there, but it was not, so I thought the repository got not ex/imported. But I was wrong. The WorkSpace is userdependent and therefore was not moved.
Now just one question about a complete backup, not moving a project or platform to another server, but having a backup for the case of system failure. How do I do this, so that I have the users backed up as well?
This does obviously not work using export/import.
When I am making a backup of the PostgreSQL database, is this enough to have everything? So that I can restore it after a break down and continue exactly where I was as I made the backup?