is it possible in PHP to write a text file to my computer?

[That's what she said]

Hi, I know it is possible to write to my server...but I would like to, ya know, back up on my c drive, incase something happens to my server...

I have been playing around with the FWrite function...

$myFile = "C:\testFile.txt";
$fh = fopen($myFile, 'w') or die("can't open file");
$stringData = "Bobby Bopper\n";
fwrite($fh, $stringData);
$stringData = "Tracy Tanner\n";
fwrite($fh, $stringData);
fclose($fh);

but that will only allow me to write to my server...(creates a text file called C:\testFile.txt)..

so yeah, can i write to my machine?

thanks.