I was thinking about changing ROMs due to problems with the camera, But, what do I have to backup in TWRP? I've seen a lot of videos and I've done a lot of research and they all say different things, I just want to backup everything I need if I have problems installing another rom (Like the IMEI is at 0 or does not start or things of that type), and not saving all apps / photos. What do I select and what not?