I working with a couple of companies at the moment who have mixed needs but they all need a backup plan. I know this article is years old but it is still hugely relevant to today. MS Backup on XP is awesome for a free bit of kit. Combine it with USB 300GB drive now a days and you have actaully quite a good starter backup kit.

http://www.microsoft.com/windowsxp/using/setup/learnmore/bott_03july14.mspx

Well worth a second peak at MS backup if you are looking at backup solution on a tight budget.