Unarchived data is where all the Leggera weight measurements are stored before you assign them to a user registered in the App.
To perform your first measurement, open the app and access the Health Scale section. With dry, bare feet, step on Leggera to start the measurement. As Leggera finishes collecting your data, you will find it in Unarchived Data.
After a few measurements, Leggera and the app will be able to identify the user and automatically assign the measures to the correct user.