Backup to external hard drive...how?

Hi everybody, i know this topic has been discussed before, but i've got a few additional questions over-and-above what's been discussed in previous posts. Thanks in advance for your help!
I just picked up a LaCie d2 extreme drive and love the fact that i'm no longer staring at how much hard drive space I have left on my little powerbook.
I've already put a lot of external files on the drive and have now decided that it might be a good idea to make a backup 'image' of my entire powerbook hard drive have it periodically update on my external LaCie drive.
1. I've only got one partition (the one that came formatted by default) on the LaCie drive. Do I need an additional partition simply for the backup image?
2. This is the point that concerns me most. I'm using the free non-registered version of SuperDuper (will see how I like it before upgrading to the full edition). When I want to save an image to my external HD it tells me that the whole volume will be erased first.
I don't want to lose the data already on the external HD so i'm wondering if it is possible to somehow back up an image of my powerbook hard drive WITHOUT erasing my external LaCie first?
Thanks in advance....
Powerbook 1.33Ghz Mac OS X (10.4.5)

Ok,
So i've decided that it would probably be easiest to backup all the data on my external LaCie drive onto my ipod and then reformat the external drive with two partitions: one solely for backups and the other for all the additional files (not on my powerbook). I'll call the main large partition "storage" and the second smaller partition "backup image". Will this work fine?
If so, does this mean that the backups would go straight to the new "backup image" partition created and it would leave the rest of my files untouched (on the "storage" partition)?
Finally, how large should I create the "backup image" partition i.e. how large should I expect the bootable disk image of my 60gb hard drive to be? Ideally i'd like to keep as much room as possible on my "storage" partition.
Thanks in advance!

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Ok,
So i've decided that it would probably be easiest to backup all the data on my external LaCie drive onto my ipod and then reformat the external drive with two partitions: one solely for backups and the other for all the additional files (not on my powerbook). I'll call the main large partition "storage" and the second smaller partition "backup image". Will this work fine?
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Finally, how large should I create the "backup image" partition i.e. how large should I expect the bootable disk image of my 60gb hard drive to be? Ideally i'd like to keep as much room as possible on my "storage" partition.
Thanks in advance!

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