Android SQL Lite DB (Room)

[showkath]

Hi ,

We are using Room persistence library & SQLite database .
Our App functionality contains TODO'S of user & We are storing user transactions in local db of mobile .
We don't have any cloud db or central database or not storing xml.

Question is to test our android app we have installed apk file in mobile. In future when we release our app to play store & when user download same app

1) Will that overwrite transactions of user performed using local apk vs playstore android app. I mean is there any data lost ?
2) When App version upgrade what will happen to db
3) Is there any way to backup current db


Thanks,
Showkath.