How does live backup work in eM Client 7.1?

Hi! Does anyone know how the backup is supposed to work in eM Client 7.1? I’m running Windows 7. The behavior I’m seeing is this: If the backup starts up while eM Client is closed, I can’t start eM. If I start the backup (Menu -> File -> Backup) within a running eM Client the backup proceeds without shutting down eM Client, however if shut down eM Client while the backup is running the backup aborts silently with no warning. Is is supposed to work that way or should the backup continue to run in the background after I shutdown eM Client? (or at least give me a warning?)