So are your ready to get your drive ready for the worst that can occur? I hope you are, because there is a wide world of ways to backup your drives, and it depends on what you are used to.
PCs and laptops. You guys are the majority, and you guys use your computers a lot. You need the best, fastest, and cheapest ways to keep your drives backed up and safe. Depending on what suits you, a simple data backup can be satisfactory, or you can go as far as a total "Windows Backup," where you not only backup the partition, but also the registry, and other data that allows you start your computer off as if nothing ever happened prior to the failure. If you want to stick to cheap and easy backups, head over to Newegg and order an external drive (such as Western Digital, Seagate, or an enclosure you can put your own drive in. Laptop users, consider the "Agent" by Seagate, a more portable version of the typical external disk) at the highest size you can afford for the investment. You will need the space! Once you have a drive set up, you can do a straight backup, or pick up a copy of Retrospect. Retrospect is a complex, but useful application for those who need a full computer backup, so you can pretend nothing ever happened! It's worth every penny, and useful when you like to experiment knowing you have an excellent fall back plan for the PC. (We also like Acronis True Image Home. It can provide whole-disk image backups as well as hard drive cloning for laptops in the event of a failure.)
Servers. Often your server provider will offer a backup service. If not, setup your own with a second provider, as backups are important to keep your clients (or your own) data safe from hackers and failure!