Creating an exact replica of Earth would require replicating its entire surface area, including the landmasses, oceans, and atmosphere. The Earth has a total surface area of approximately 510 million square kilometers (196.9 million square miles).
To create a replica, one would need an area of land or a structure large enough to accommodate this surface area. The replica would need to account for the curvature of the Earth and include accurate representations of the various geographic features, such as mountains, valleys, and coastlines.
There are several ambitious projects that aim to create scaled-down replicas of the Earth, such as certain theme parks or architectural projects. However, these replicas are not exact in terms of size or geographic accuracy.
In reality, creating a full-scale replica of Earth's surface area is currently beyond our technological and logistical capabilities. The sheer size and complexity of Earth make it an extraordinary challenge to replicate in its entirety.