How should I do to properly use the sp_msforeachDB to create and delete backups - sql-server-2008

Question

I'm setting up a new way to create and delete backups in our internal environments. The space on the servers is a big issue so i really have to find a way to do a backup and delete the older one for each database, procedurally.
I came up with the idea of using the sp_MSforeachdb and simply do a backup. On success, it would delete the older backup that was done the day before. (we do 1 backup per night).
DECLARE #DBOPurpose Varchar(15)
DECLARE #Drive Varchar(1)
Set #DBOPurpose = 'Omnilabs'
DECLARE #command varchar(Max)
Select #command = '
If Exists (Select *
from sys.databases
where name like ''%?''
and name like ''%'+#DBOPurpose+'%'')
BEGIN
EXECUTE master.dbo.xp_create_Subdir '+#Drive+':\SQLBACKUP\'+#DBOPurpose+'
GO
BACKUP DATABASE [?] TO DISK = '+#Drive+':\SQLBackup\'+#DBOPurpose+'_Select Cast(Cast(Year(Getdate())As Varchar(150))+''_''+Cast(month(Getdate())As Varchar(150))+''_''+Cast (Day(Getdate()) As Varchar(150))+''_''+ cast(DATEPART(hour, GETDATE()) as varchar) + '''' + cast(DATEPART(minute, GETDATE()) as varchar)+ '''' + cast(DATEPART(Second, GETDATE()) as varchar)+ ''.bak'' As varchar(150))
END
Print N''TEST''
'
--Select #Command
EXEC sp_MSforeachdb #command
I was expecting that doing Select #Command would actually show me something, but its null. When I run this, it simply writes "Commands completed successfully." within a second, which doesn't make any sense.

Answer 1

Just saw my error, which was only caused by the hyphens that were not placed correctly. Here's the code:
If exists(Select * from #TempDBName where DBNAME = #DBOPurpose)
BEGIN
DECLARE #ERROR bit
DECLARE #command nvarchar(Max)
SET #Error = 0
SET #command = '
DECLARE #DBO VARCHAR(15)
Set #DBO = ''%'+#DBOPURPOSE+'%''
If Exists (Select *
from sys.databases
where name like ''%?''
and name like ''%''+#DBO+''%'')
BEGIN TRY
PRINT ''?''
EXECUTE master.dbo.xp_create_Subdir '''+#Drive+':\SQLBACKUP\TEST\?''
BACKUP DATABASE [?] TO DISK = '''+#Drive+':\SQLBackup\'+#DBOPurpose+'_' +(Cast(Cast(Year(Getdate())As Varchar(150))+'_'+Cast(month(Getdate())As Varchar(150))+'_'+Cast (Day(Getdate()) As Varchar(150))+'_'+ cast(DATEPART(hour, GETDATE()) as varchar) + cast(DATEPART(minute, GETDATE()) as varchar)+ cast(DATEPART(Second, GETDATE()) as varchar)+ '.bak''' As varchar(150)))+'
END TRY
BEGIN CATCH
Insert into BackupExecLog(ErrorDate, ErrorNumber, ErrorMessage)
Select Getdate(),
ERROR_NUMBER() as ErrorNumber,
ERROR_MESSAGE() as ErrorMessage
Set #Error = 1
END CATCH'
Select #Command
--EXEC sys.sp_MSforeachdb #command