Hi.
The background image depends on the size of the block that contains it. There are no options in the aspect of responsiveness for the background image. You can only regulate this with the size of the block or replacing the background image at the breakpoints.
I solved it by duplicating the row.
This is the only interface solution that is in SPPB at the moment.
However, this is not a very good solution, since the elements hidden at the breakpoints still remain in the site code.
The best option is the use of CSS to replace the background image of the section at the breakpoints, instead of creating the section's duplicate containing another background image.