There are various theories on the formation of our solar system, with Jupiter playing a crucial role. According to the Nice model (Morbidelli et al. 2018), the presence and evolution of Jupiter and Saturn in the solar system might have been critical to allow the existence of the inner planets in their current orbits. Zhu & Wu (2018), Bryan et al. (2018), and Rosenthal et al. (2022) show that outer (>3 AU) giant planets enhance the occurrence of inner small planets (0.03-1 AU, 2-30 M⊕). Stars with long-period Jupiter mass companions are thus a good place to start searching for habitable planets like ours and to put our solar system into context. However, of the currently 5903 known exoplanets, only 5.7% have periods longer than 3 years, and 2.5% longer than 10 years. The long-term HARPS RV survey of extra-solar planets provides data with a baseline of 20 years, which allows for the detection of long-period RV variations. We present some of the most recent results (Frensch et al. 2023), plus the cross-match of the survey with identified TESS Objects of Interest.