All of your Haystack contacts get automatically backed up and synced to our cloud when you are signed in with your Haystack account.
You can sign in, or check which account you are signed in with through Haystack's settings: Open the app > Tap 'Settings' (on Android, access through the 'three lines' at the top left).
To move your Haystack contacts to a new device:
Tap 'Have an account? Sign in' and sign in using the same email address that you originally used to signed in
As soon as you sign in, Haystack will start loading all of your contacts onto the new device.