Restoring to another device

[Occasional Traveller]

first off, this is a fantastic app - see my review.

My only question is how to you restore your backed info onto another device?

I have entered all my info onto my IPad ( easier to take photos from) and its backed up into Dropbox.
How do I synch this onto my Iphone 6 plus ( I don't use ITunes as it messes up my apps)

Do I logout of Dropbox from my IPad ? I don't want to use save on new docs for my IPhone in case it saves a blank canvas to Dropbox and then that overrides the data I have on my Ipad