We developed YARARA (Cretignier et al. submitted), a new post-processing pipeline designed to provide more precise RV time-series. The pipeline is a data-driven approach based on spectra-timeseries corrections by PCA. Such methods have already proven their value and is well dedicated for stars intensively observed. YARARA is therefore in adequation with observational strategies needed to detect the exoplanets that induce signals below a few m/s in RV. The correction of spectra time-series allows to simultaneously correct for instrumental systematics and stellar activity, preserving the planetary signals. By applying YARARA on three years of HARPN solar observations, a RV precision of 76 cm/s can be achieved (Cretignier et al. in prep), a precision level already sufficient to detect Earth-like planet around Sun-like stars.