How to back up iPhone / iPad without PC or iCloud? Are there ways besides iCloud or using a computer with iTunes to back up data on your iPhone or iPad?
One way seems to be a USB flash drive with a lightning connector... But is that just for photos and not other data like internet bookmarks, notes, etc.?
I'd say… No. 

The backup structure would require some kind of 'smart' object at the other end.
You cannot just connect a storage medium &amp; push data to it. It is just not designed that way.