You can backup and restore your actual system with the TWRP dedicated feature
@itsclarence Test builds
s6-zerofltexx . s6edge-zeroltexx (oreo) Testing results can be found here : /e/ on Samsung Galaxy S6 Edge SM-G925F (zeroltexx)
Last official dev builds : s6-zeroflrexx . s6edge-zeroltexx (nougat)