Mirror images to 4/8 sides

[Zwergchen]

Hey there,
how can I mirror an image in this way?


I need it to create seamless textures ^^

While editing the "main", all the "mirrors" should be updated.
And if possible, the "mirrors" shouldn´t be paintable.


My current workflow is to mirror it by myself a lot of times till it is perfectly how I want it, but it´s a horrible way...