iTunes, the crappiest software in the world.
To make local itunes backup, it forcefully choses C drive and there is no way to change backup partition. I don't have 96 gb free in C drive and now it will not make local backup.
Then had to use recovery mode to update software of another bootlooped iPhone, and at about 80% firmware download via iTunes, I lost wifi connectivity for a few seconds and now it started downloading from 0% even though i chose to resume the download. RIP download resume system. Download server speed is very slow (around 2mbps) on 8mbps connection and even tried on 4G and speed was same.
I don't remember a single good troublefree complete experience with iTunes, or any Apple products. One way or the other especially in difficult situations, it becomes a headache.