This property works with the DiscardTimeUnit property. This property indicates a time interval in which data from a Self-Healing-type Electrical Study is stored on a database table, until it is discarded. Default value of this property is 1, that is, one time unit indicated by the DiscardTimeUnit property. If this property is set to a value less than the value of the BackupDiscardInterval property, Elipse Power automatically sets the value of the BackupDiscardInterval property as double the value of this property.