This depends on where you are a student or tutor.

 For tutors, the whiteboard/classroom does not save automatically and you need to save it manually. There are two ways to do this. To save a whiteboard as a static image (jpg file), right click on the tab and select "Download as Image.” To save the entire classroom (all boards), click the three vertical dots at the top right and select "Export…” This will preserve all work from the classroom, however you will need to import it into another classroom in order to view or edit the contents.

For students, the the whiteboard/classroom saves automatically on HUB and can be accessed here: http://shzam.thelessonspace.com/subdomain/shzam/login