Recently I had accidentally clicked an upgrade to ...

Recently I had accidentally clicked an upgrade to 1250Gb via Stack, which apparently could not be undone. The stack had to be completely removed and recreated which I found annoying because all the data would be lost. Once the stack has been upgraded, it apparently cannot be reversed. A bit strange in this high-tech world of IT, but everything was steered in the right direction by Felix. Finally my new stack was created and I can continue. Thank you for the assistance !