Google stores 'transient' Allo messages until you delete them
 

Back when Google first announced its brand-new chat app Allo, the company told The Verge it would only store messages "transiently," not indefinitely. But since May, when the app was first announced at Google I/O, things have changed a bit in that re...

https://www.engadget.com/2016/09/21/...sages-privacy/