Backup files on CD or DVD. nice and easy
Backup complete drive onto anther drive and make it bootable. This way you can launch the mac from the backup (and put everything back) if something went wrong.
look for these apps that will do this for you
CarbonCopyCloner CCC
SuperDuper
Go spend a hundred or two on an external drive, then use something like CarbonCopyCloner (great) or Deja Vu (my choice, easier to control) to automatically backup. My iMac wakes up at 6:00AM each day, 10 minutes before I do, and makes a full backup of all user libraries and documents folders. Just to be safe it does a weekly backup in a separate location.
I intend to have my files, come hell or high water
Same here. I've recently just reinstalled OS X because i was having a few hardware problems (looks like it has cleared up now ... touch wood).
I used a combo of backup and SuperDuper ... 250GB to spear, why not!
Both are very good but i like SupderDuper more. Everythings back to normal now thanks to it, defiantly worth the investment (16.62)