My 160G HDD in my XPS seems to be making a funny noise. When it spins up there is this, like squeak. Kinda like metal on metal. I am wondering if the head is bumping the platter. It may have always done this and I'm just noticing it, but it got me thinking... I have reached the point where, if I lost my HDD, life might end as I know it. I have never backed anything up before. (I'm sure I'll take some abuse for that ) I am going to get another internal drive for my XPS. I have Norton Ghost but have never used it. My questions are...

1) How much backup HDD space would you suggest for me? I have a 160G HDD 110G full.
2) Is Ghost the right program for backup or is there something better out there?
3) I have a DVD burner, Can I burn Ghost image onto DVD?

Any other info that you have would be very appreciated.