Does backup in iTunes also backup pictures and videos
My son has a ton of pictures (and a few videos) on his iPhone 5s. He is currently on IOS 8.x. I want to upgrade his phone to ISO 9.x. If I connect to iTunes and do a "backup", will everything on the phone (including pictures and video) get backup up? I know that when I connect my iPhone, the Photo application opens up asking me to upload my pictures from my phone. I realize this is a good idea as well, but if I skip that step and JUST do the iTunes backup, am I safe in case I need to erase and restore from the backup? Will I get all my pictures back as well?
Thanks.
Mac mini, Mac OS X (10.6.8), 2010 Intel Core 2 Duo / 8GB RAM