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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: 25 Oct 2003 10:57:04 -0400
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Subject: Re: Help: tar & find
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> > Thanks for the response, but what would be a better solution?
> 
> There are several possibilities, all of which equate to passing the
> list of files to backup to the tar command (or equivalent) via stdin
> rather than the command line.  Perhaps the simplest is to use the '-I'
> or '-T' flag to tar(1):
> 
>     find $FILES_DIR -xdev -type f -iname '*.bak' -print0 | \
>         tar --remove-files --null -T - \
>             -cvzpf $TAR_DIR/bak_files_`date +%F`.tar.gz
> 
> Other possibilities would include using cpio(1), which can be
> persuaded to emit tar format archives, or to build a perl backup
> script based around the File::Find and Archive::Tar modules.

Or passing the date in an environment variable.
I think something like

     datestamp=`date +%F`
     find $FILES_DIR -xdev -type f -iname '*.bak' -print0 | \
         tar --remove-files --null -T - \
             -cvzpf $TAR_DIR/bak_files_${datestamp}.tar.gz

should work.