Executed as user: SQLserver\serveruser. 
Microsoft (R) SQL Server Execute Package Utility  Version 11.0.6020.0 for 64-bit  Copyright (C) Microsoft Corporation. All rights reserved.    
Started:  09:09:16  Error: 2017-10-27 09:09:16.73     
Code: 0xC002F304     
Source: Create Dir in Net Storage File System Task     
Description: An error occurred with the following error message: "Could not find a part of the path 'W:\DBBackUP\SERVER1\dirTest\'.".  
End Error  DTExec: The package execution returned DTSER_FAILURE (1).  
Started:  09:09:16  Finished: 09:09:16  Elapsed:  0.172 seconds.  The package execution failed.  The step failed.

dir W:
IF %ERRORLEVEL% GEQ 1 (net use W: \\somepath)

declare @NetPathBkp nvarchar(500) = '\\NETSHARE\backup$' -- other server required the '\\10.x.x.xx\\backup$'
		,@LocalPathBkp nvarchar(500) = 'DBBackUP\SERVER1'
		,@UserName  nvarchar(500) = 'SERVER1\poweruser'
		,@UserPwd  nvarchar(500) = 'xxxxxx'
		,@DrvName nvarchar(3) = 'W:'
		,@PathMount  nvarchar(500) = ''
		,@PathBkp  nvarchar(500) = ''
		,@ReturnCode int = 0

Set @PathMount = CONCAT('NET USE ', @DrvName,' ',@NetPathBkp, ' ', @UserPwd, ' /USER:', @UserName,' /PERSISTENT:NO');
print @PathMount -- NET USE W: \\NETSHARE\backup$ xxxxxx /USER:SERVER1\poweruser /PERSISTENT:NO

		EXEC @ReturnCode = xp_cmdshell @PathMount

			if (@ReturnCode = 0)
				begin
					print 'Folder is mounted Ok'

					-- TODO any tasks

					Set @PathBkp = concat(rtrim(ltrim( @DrvName )) , '\' ,  rtrim(ltrim( @LocalPathBkp))+'\', 'NewFolderBAK')
					EXECUTE master.dbo.xp_create_subdir @FolderBkp 

					-- ........	

				end
			else
				begin
					print 'Folder is NOT mounted'
				end


-- ........				


-- UNmount drive after all tasks
		Set @PathMount =  'NET USE ' + @DrvName + ' /delete /y' 
		EXEC @ReturnCode = xp_cmdshell @PathMount
		if (@ReturnCode = 0)
			begin
				print 'UNmounted Ok'
			end
		else
			begin
				print 'ERROR: Folder is NOT UNmounted'
			end