You can determine overall progress of Backup operation comparing ObjectNumber and ObjectCount properties. To determine detailed progress for particular table you can use Progress and MaxProgress properties.
This property is not used in events fired by Restore method.
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2