I use Rebit, it's the single closest thing to OS X's Time Machine that I've found. I bought the software version, not the software-and-drive version. You plug in an external drive, tell it to use the drive, and then forget about it.
I've used a number of other pieces of backup software in the past and all of them took too much effort to keep your files backed up. Rebit is perfect for that sort of scenario. On the downside, you don't have as much control as other software gives you. Do you want backup software that you install and then forget about? Rebit's your choice. Do you want fine-grained control over how often the backup runs, what time, which files are excluded? Rebit isn't right for you.