Keeping backups of your most important data is one of the single most important things to do on your computer. After all, what’s the point in spending all of that time editing photos and composing documents if they just get lost after a hard drive failure? There are lots of programs out there that offer a boatload of features, many of which you won’t use. If you simply want the contents of a folder to be mirrored on another drive, then† you might give FolderSync a look.
This tiny piece of freeware allows you to compare the contents of two folders, to ensure that the same files are on both. If not, you can synchronize them, effectively making sure that you have two copies of each file, just in case. The software can also tell you the difference between similar files, letting you know how bigger, smaller, newer or older one is over the other.