def prepare_backup
      unless @original_server = RDSBackup.get_rds(rds_id)
        names = RDSBackup.rds_accounts.map {|name, account| name }
        raise "Unable to find RDS #{rds_id} in accounts #{names.join ", "}"
      end
      @account_name = @original_server.tracker_account[:name]
      @rds = ::Fog::AWS::RDS.new(
        RDSBackup.rds_accounts[@account_name][:credentials])
      @snapshot         = @rds.snapshots.get @snapshot_id
      @new_instance     = @rds.servers.get @new_rds_id
    end
def prepare_backup
      unless @original_server = RDSBackup.get_rds(rds_id)
        names = RDSBackup.rds_accounts.map {|name, account| name }
        raise "Unable to find RDS #{rds_id} in accounts #{names.join ", "}"
      end
      @account_name = @original_server.tracker_account[:name]
      @rds = ::Fog::AWS::RDS.new(
        RDSBackup.rds_accounts[@account_name][:credentials])
      @snapshot         = @rds.snapshots.get @snapshot_id
      @new_instance     = @rds.servers.get @new_rds_id
    end
Queries RDS for any pre-existing entities associated with this job.
 Also waits for the original RDS to become ready.