For more information, please see http://www.codit.eu/4662.aspx

IBaseMessage.cs

public Microsoft.BizTalk.Message.Interop.IBaseMessage Execute(IPipelineContext pContext, Microsoft.BizTalk.Message.Interop.IBaseMessage pInMsg)
{
    object backupTransportVal = pInMsg.Context.Read("BackupEndpointInfo", "http://schemas.microsoft.com/BizTalk/2003/system-properties");
    
    if (backupTransportVal == null)
    {
        //Not present => no backupTransport configured => use default
	//Perform Actions
    }
    else
    {
	string sBackupTransportVal = backupTransportVal.ToString();
	if (!String.IsNullOrEmpty(sBackupTransportVal))
	{
		//Present, not empty => BackupTransport is configured, but not executing the backupTransport
		//Perform Actions
	}
	else
	{
		//Present, but empty => BackupTransport is configured and is being executed
		//Perform Actions
	}
	}
	//Continue with additional actions
}