Mac OSX/Gentoo dual boot ?

I am a Gentoo and PPC Newbie. I have been running Debian on x86 machines
for several years.

	I have an M5343 PowerBook I picked up on eBay.
It came with Mac OS X installed on a 30GB HD, the HD is mostly empty.
It did not come with OS X CD's.

I have installed Gentoo on a 15GB HD I had lying arround.

To move between Mac OS X and Gentoo I have to swap HD's

I am looking to try to get Gentoo and OS X onto the 30GB HD.

I know I can just backup the Linux files onto another system and copy 
them back to a new partition once I have one ready.

Is it possible to do the same with an OS X partition ?
Can I backup an OS X hfs partition to another hfs partition under Linux 
without loosing any information ?

Can I resize an OS X hfs partition ? Can I do it under Linux ?

If I backup the OS X hfs partition to another hfs partition  somewhere, 
and then later copy it back to a smaller partition. do I need to do 
anything secial - besides properly setting up yaboot.conf to make the 
new hfs partiton bootable ?

I know all about how to do all of the above for x86's and NTFS, and all 
the tricks. I bought the PowerBook to learn more about Mac's.l So I 
guess this is learning.

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