Install /e/ on a Fairphone FP4 - “FP4” (beta)

I’ve got everything in place now, but got stuck with the backup options. Found this thread stating that TWRP misses user data and this wiki and now I’m confused and would appreciate a hint into the right direction.
I can live with backing up my files manually, but would like to back up system settings and app settings to recover my FP4 to the state it is right now.
Is adb the way to go?