The purpose of 2 terraces and a garage set far back with just over 240 sqm can probably only be explained by the developer. I also find 6 sqm a bit tight, but paving the entire backyard is definitely not a solution. I would completely omit the front terrace, enlarge the rear one to 3x4m, and place it with a 1m gap for a privacy hedge towards the neighbor. Then a path with a bit more slope to the garage, similar to the one drawn in the picture. But not with large slabs, rather with small cobblestones.
