Microsoft SQL Server Virtual Backup Device Specification
Server State Diagram
This illustration shows the server view of the life cycle of the virtual device set.
For the functions OpenDevice and ExecuteCompletionAgent, the active state is not entered until all devices are opened and the completion agent is running. If Close is invoked from any state except Terminated, the function implicitly performs SignalAbort processing to move to an Abort state. It then immediately transitions to the Does Not Exist state.