The number of days for which automated backups are retained. Setting this parameter to a positive number enables backups. Setting this
            parameter to 0 disables automated backups. Default: 1 Constraints: 
- Must be a value from 0 to 35
- Cannot be set to 0 if the DB instance is a source to read replicas
 Declaration Syntax
 Declaration Syntax| C# | 
public int BackupRetentionPeriod { get; set; }