When creating your station (or in Settings after you create your station)you will be asked if you would like to activate offline support. Offline support allows you to continue to use your check-in station if you lose your internet connection.
Enabling this will store all information needed to run your system in your web browser completely offline. When your connection is restored all check-in data is synced to the cloud.
Important - Face Detection and Sexual Offender Checks will not work if you do not have an internet connection.