This property works with the DiscardTimeUnit property and indicates a time interval in which Alarm data is stored on a database table, until it is discarded. The default value of this property is 1 (one time unit indicated by the DiscardTimeUnit property). If this property is configured with a value less than or equal to the BackupDiscardInterval property, Elipse Water automatically sets the value of this property as doubles the value of DiscardInterval.