Boot HD larger than Backup HD

Hello!
i have two questions before i purchase superduper:

1. My Macintosh HD is 300GB. 100GB used and 200GB free space on it.
Can i create a bootable Clone of this HD to an external HD with 150GB?

2. This is not a real question. I just want to be sure I understood it right before I purchase SuperDuper.
I need a working OSX for my job and because of that I can't simply switch over to Snow Leopard without any kind of safety measure. When i create a bootable clone of my Macintosh HD to an external HD i can do the following when i experience problems with Snow Leopard:

a) I recover my System from the bootable Clone,
or
b) I can keep Snow Leo on my Macintosh HD and additionally boot from the Clone and work with this...

Is this correct?(especially 2b)


My Mac:
iMac 7,1 (Alu, Mid 2007)
Intel Core 2 Duo
Mac OS X 10.5.8

Thanks in advance,
imodium

[dnanian]

1. Yes. Make sure it's properly partitioned (see the Frequently Asked Questions section of the SuperDuper! forum).

2. a) You can recover your entire backup, but not just the system.
b) Generally, yes... but you'd be working on the copy, of course.