I got android nougat on my phone and of course my root was gone
It was dearly easy, but along the step of doing it I had to format some partitions (like /data), after that I flashed some zips and put the backup of my data partition back on my phone
Pictures where missing, some app data where missing, also WhatsApp pictures and videos

Turns out, twrp saves pretty much everything, but leaves out the user data folder, where all of that stuff would've been
I'm just happy that I'm not one of those people who don't need to keep thousands of pictures

I don't really know what kind of stuff I lost, probably not too important