If you use Ghost, just make sure to restore to another drive and test it before you decide you are protected. I have seen Ghost *NOT* work more often than it does work. Also, there are many versions of Ghost, and at least two levels of product -- reflected in the price.
If you are using HDA as a boot drive only, then use something like Partition Magic 8 to shrink down the "/" partition to somewhere between 2 and 3 GB. This will make your image-making much faster. Also, if HDA is a boot drive only, the image can easily fit on a CD-Rom.
Good Luck,
Tom