Localytics collects data from your users each time they have an app session, even if that activity occurs while a user is offline. Localytics SDK is built to store data locally (on the client) while a device is offline and then upload it to our service at the next available opportunity (typically, the next time the device has a session while online).
Our servers will accept data uploaded for up to 28 days after the activity date, and the SDK will cache up to ten sessions of data while a user is offline. Data is timestamped and reported in the Dashboard based on the date of activity, not the date of upload. As a result, it's possible to see the number of Users, Sessions, and Events for a prior date increase as our services receive additional data for activity that originally occurred offline.