Moving whole partitions

Hi!
Right now I am using Ubuntu 6.10, and I have Debian etch and winXP installed as well.
What I wanted to do was to reinstall WinXP (getting slow again...), and use the Occasion to change my partitioning, because when I installed my Linux system, I didn't really know how I should do that.
Anyway, I wanted to ask how I could manage to copy some whole partitions (preferably as is, e.g. as an image) to an extern hard drive, repartition my disk and get the partitions back onto my hard drive again.
First question: Can I copy a whole partition, and if yes, how.
Second question: What do I have to change in my linux systems to get them working again (apart from grub menu)
Third Question: Can I resize a partition?
Fourth question: My Ubuntu partition contains both the / and the /home directories, which I now find quite inconvenient. Is there a chance to split them now without reinstalling the whole system?

Thanks in advance,

Alexander Korsunsky
.

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