Hi,
This is still happening to me on an iPad Pro 9.7” running Beta 5. It all started after I enabled iCloud Photo Library for the first time ever a few weeks ago. I had >30GB free before then, and now I’ve got 8GB free and 26GB used by System (it was 24GB yesterday and I had 10GB free).
[doublepost=1502200040][/doublepost]Hi,
OK, this was unexpected - I may have found a solution to this (or it could just be coincidence). I was in the process of filing out a bug report about this issue still being there in Beta 5, and triggered the generation of a fresh sysdiagnose report before I did so. And when I went to attach the new sysdiagnose, my “System” usage had fallen from 26GB to 8GB. So somehow triggering the creation of the fresh diagnostics has sorted this out, at least for now. So this is definitely something that could be worth a try for anyone else who’s having this issue.
For those who are unfamiliar with the process, you trigger the creation of a sysdiagnose dump by holding down both volume buttons and the power button for about a quarter of a second.