Superduper; yes it requires a second drive as it will make a bootable copy of the current drive.
What size drive do you have now?
I'd recommend picking up an OEM drive from newegg.com
match the size; so if its 250 get a 250 or bigger..
(its only going to copy what you have used...so if you have lets say a 250 for example and are only using 80GB of space...it will just copy that 80GB of space to that drive)
My recommendations are Western Digitals AAKS series; they all have good cache and speed.
I have a 2500AAKS for MBP backups, 5000AAKS and 7500AAKS for bootable back ups and media storage; completely invaluable!
And with prices lowering, you can catch a good deal too.
Making a bootable back up is good especially for OS drives; basically in simple terms atleast....lets say your drive starts acting funny, maybe its crashing alot or a power surge occurs and the drive doesnt seem to be working properly any more.
Having a bootable back up basically entails you to insert that drive into the system and start off from that Date you made that last copy and you can boot into the same OS and environment you had on your drive you were just using that stopped working or is having issues.
SuperDuper has functionality to do Timed/Scheduled back ups on the date of your choice (i think that costs 27-29$ ?? im not 100% but that is a fair price to pay for your data security)
So it in a sense it would be sort of similar to a TimeMachine for Tiger.
Which is what I tend to do with my 10.4.10 installation.
But the free version allows you to do FULL COMPLETE Bootable back ups whenever you want.
Time Machine with Leopard basically copys over files, folders and that sort of Data. and that only copies the USED space, so for example a system running Leopard on a 320GB drive and only using 120GB of space, that will be transferred over to the Time Machine drive itself.
It is not "bootable" but its it makes it easier to recover files and data quickly.
Lets say you lose a few Word Documents or Photos from your library or even music..etc etc...you can go in there and goto a specific date you know you had it and can recover the files and structure of that Date so your files and such are as it was on MM/DD/YY you recovered from.
hope that made some clarity.
