Online Application Unplugged
You may not know that SB works offline most of the time.
By saying ‘offline’, I mean when it’s not communicating with our servers. After loading all project content, SB doesn’t have much server-side interactions^.
The beauty of this design is if you hit on a connection problem to the Internet, you can keep on working and save your design once the connection resumes.
When SB experiences a connection problem with our servers, it will show you this warning:

This is to calm you down and assure you that you can save your work once you get back the connection. You will also see a little warning message on the right hand side of the top info bar that you can click on to check if the connection has resumed.

^Other major server-side operations include saving project, committing a version, generating alter scripts, diff reports, etc.
