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If Earth started spinning backward, the consequences would reverberate through every aspect of life on our planet. Firstly, the most immediate effect would be on the day-night cycle. Currently, Earth rotates on its axis from west to east, causing the sun to rise in the east and set in the west. If the direction were reversed, we would witness an inverted cycle, where the sun would rise in the west and set in the east. This profound shift would disrupt the biological rhythms of countless organisms, including humans, ostensibly leading to confusion in both diurnal and nocturnal species.

Moreover, this reversal in rotation would have a significant impact on global weather patterns. Earth's rotation affects the jet streams, which are essentially fast-moving air currents that influence climate. If the spin reversed, these jet streams would also change direction, leading to unpredictable weather systems. Regions currently warm could experience cold fronts, while typically temperate areas could endure extreme heat. The ecosystem would be challenged, as many species depend on stable weather conditions for food and habitat.

In terms of gravity and centrifugal force, the reversal would also create notable changes. Currently, the centrifugal force from Earth’s rotation slightly counteracts gravitational pull, making us feel marginally lighter at the equator than at the poles. A backward rotation could alter these forces, affecting everything from the ocean tides to the distribution of masses on Earth. This might lead to unusual tidal patterns, potentially causing more extreme high and low tides that could flood coastal areas or significantly alter marine ecosystems.

Additionally, our planet's magnetic field, which is intricately linked to its rotation and core dynamics, might be affected by this unprecedented change. The geomagnetic properties of Earth could result in shifts that not only alter the magnetic field strength but may also impact satellite communications and navigation layouts. Such dynamics would not only affect technological communication systems but could also expose the planet to increased levels of cosmic radiation, as the magnetic field offers a protective shield against solar and cosmic rays.

Considering the implications for human society, our everyday lives would face challenges on multiple levels. Timekeeping systems, which are intricately tied to the solar day, would need to be revised. Businesses, schools, and public transport systems would be disrupted. Daily routines and schedules would require renegotiation to adjust to this new day-night rhythm.

Overall, if Earth began spinning backward, the dramatic transformations would stretch from the microcosm of individual life forms to the macrocosm of global systems. The biophysical, environmental, and societal impacts would necessitate a profound adjustment for all inhabitants of this planet. The very fabric of life as we know it would be woven anew, challenging our understanding of time, space, and existence itself.