Welp - 4 years of work down the drain because of this.
@taehoshino any update on this. when you “logout” why does postman need to
“Signing out removes your synced history, collections and environments from local storage.”
Why doesn’t postman simply leave your data there and allow you to dissassociate with the cloud? Are you becoming the next Oracle? 
What’s next, will postman stop working offline?
Incredibly frustrated right now. I also decided to create an account on Postman, and doing so wiped my history, including all of my collections.
This is incredibly un-intuitive functionality with potentially serious consequences for unaware users. Please address this issue.
How is this still a thing? Add me to the list of users who have used this for years and lost everything BY SIGNING IN. Got a new computer and created an account to sync up my stuff and lost years of queries.
Holy shit guys, what the fuck? AT least pop up a warning first that this will wipe all of the data in your scratch pad.
О боже мой, постман я тебя ненавижу!
он стер все мои коллекции, что я собирал 5 лет
это такой кусок говна