You can, if you are a hardcore user expose it to Tor and use it as inbox relay. So people can send Dms to your relay on your phone without ever needing to use any relay. 

And you can backup your notes 

 I was thinking to use citrine along with locus app. What do you thini of this? 

 What's locus app? 

 https://f-droid.org/packages/app.myzel394.locus/