need help with backing up an iphone xs
i need to back up my gf's iphone xs max but system data is taking up so much space that i can't even back up anything to icloud. phone currently has 150mb available space left and i need to back it up, factory reset it and sync everything back to the phone.
so far i tried apple devices app on windows, but it disconnects after couple minutes and automatically choses the icloud backing up option even tho i chose local backup to my computer.
any help would be appreciated