sp_BackupDatabases can be found here: http://support.microsoft.com/kb/2019698
database_backup.bat
md c:\temp_database_bak
sqlcmd -S {{MACHINE_NAME}}\SQLEXPRESS -Q "EXEC sp_BackupDatabases @backupLocation='c:\temp_database_bak\', @backupType='F'"
FOR %%A IN (%Date%) DO (
FOR /F "tokens=1-3 delims=/-" %%B in ("%%~A") DO (
SET Today=%%D%%B%%C
)
)
"C:\Program Files\7-Zip\7z.exe" a c:\backup_mssql\Database_BAK.%TODAY%.7z "C:\temp_database_bak\"
rmdir c:\temp_database_bak /S /Q