After i created a duplication along a curve with this method I want to mirror the whole thing. If I add a mirror modifier on the curve and the object it doesn't the object is not transformed along the curve.
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Instead of using the duplicate method post din your questions you can use an array modifier and a curve modifier.
1. Add Curve
Add -> Curve -> Bezier
move it (in my case I moved it along the positive x-axis)
Place the origin at the start of the curve path
Add a plane at the same location
Scale it down
Apply Location: Ctrl A Location
Select plane, add array modifier Fit Type: Fit Curve Relative Offset modify to move in the direction of the curve
Add Curve modifier to plane
Add mirror modifier