I am having the same problem. I can understand the “system” to take up to 8 or 9GB. But the “other system data” takes up to 18.56GB in my iPhone. That’s way too much and it is unacceptable. Not only that, but if you combine it with the “system” it takes about 26GB in my phone!!! That’s absurd! If I knew that, I would have chosen a phone with a better memory. I have the 64GB iPhone, I AM LITERALLY LEFT WITH NOTHING. And I noticed that the “other system data” is slowly growing, yesterday it was 15... today 18.56! Just like that! To me, this is very annoying, because I use my iPhone with my action cam and drone. Do not get me wrong, I do know that when they tell you the phone has 64GB, it doesn’t actually have 64GB of free space. I understand that very well, but this is exaggerated. It is the first time I buy an iPhone, I can tell that I am not happy at all about the memory issue. If I’ll find a solution, I’ll share it with you.