Selling my Lumia 920 (Things to do before it's gone)

Hi all

I'm selling my Nokia Lumia 920 to a family member. I've gone back to the iPhone (most of the products I own are made by Apple. So it's nice to be completely in that ecosystem).

What are the things that I have to do before it's gone?

Delete the backup from MS Servers, deauthorize applications, etc.. ? Anything else that I'm not thinking of?