How can I make a hard disc partition?

Dear sir/madame,
I have a mac OS X leopard with one partition and I want to upgrade to Lion, I have an external hard disc and I am always making backup on it, so is it safe to upgrade my system without copying all my data to the external HD?
And if I make a new partition on my system and put all data I need on it, then I install the Lion on the other partition, will the data be deleted?
With thanks in advance,,,
Nadim

It is always recommended that you have a complete and up-to-date backup of your system disk before doing a major upgrade like Lion. Although it should go smoothly, you never know when there might be a problem. And that is no matter what kind of computer you use.
You can use Disk Utility on your Mac to partition a hard disk. But I don't know if it can do it without erasing the disk. Older versions always erased the disk, but newer ones might not. Regardless, once again, the recommended practice is to have a complete and up-to-date backup of any disk you are going to partition.

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