file name with current date

Clarifications

might entice someone to give a response.

OS (version of Windows)?
Backup Application?
Data being backed up ?
Backup schedule?
??
??

To do this from a batch file, you'll need to determine what you want backing up and how.

I'm assuming you have the command line you can run which will backup your data to a file, say backup.bkf? If not, the switches can be found here:

http://support.microsoft.com/kb/814583

The following batch file will then rename the file backup.bkf to include today's date:

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@echo off

Rem Insert your command line to call ntbackup to create a backup.bkf file here

for /F "tokens=1-4 delims=/ " %%A in ('date/t') do (
set DateDay=%%A
set DateMonth=%%B
set DateYear=%%C
)

set CurrentDate=%DateDay%%DateMonth%%DateYear%

If exist backup.bkf rename backup.bkf backup%CurrentDate%.bkf

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