backup with dd tool

[Nabin Limbu]

Hi,

I want to clone my hard disk with dd tool. One of my partition has about 6 GB of 
contents. so whenI try to backup my partition with the command:
	dd if=/dev/sda1 bs-512 | gzip -9/mnt/sda3.dd.gz, 
then I got error saying file size limit exceeded after backing up 2GB. It seems file size 
has limited only up to 2GB size. Now how can I backup my 6GB content with dd tool.

With Regards
Nabin Limbu