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Full user review
"Hotter than two rats humping in a wool sock!"
FREE if you plan to back up an ENTIRE HD (a 1TB drive) anywhere but online - friend's computer, external, or another internal
Compressed (my 783 GB was backed up to 602 GB)
Extremely simple to use
The only thing I wouldn't recommend this for is to share a small amount of data (2GB or less) across multiple computers. Programs like Dropbox do this better (assuming you want something free).
I've used Dropbox, Sugarsync, Acronis, Norton Ghost, Cobian, Carbonite, Mozy, and many others. Each worked decently well in their own way, but I still felt like I was missing something - user friendliness, features, simplicity, or my wallet being heavier.
If you have one of two home computers (or sometimes-home computers like a laptop) with no desire to back up online (which always made me ask, 'Where exactly is my data and who has access to it?'), Crash Plan is completely free. The free version is supported by ads, but they never pop up in your face and are neatly tucked in the corner below the menu. Even the ad placement makes sense. However, I noticed that even if I DID want to backup online, it costs less than it does with Mozy or Carbonite.
I'm running 4 hard drives, a 500GB for the OS and apps, an 80 GB for a Windows image, and 2 1TB drives, one of which has all of my games, pictures, movies, and documents. I've had that data for decades, so If I ever lost it I would be devastated! I've been diligently searching for the perfect backup solution that is easy to use, easy to maintain, easy to restore, and doesn't cost a penny. Needless to say, I am no longer searching.
Crash plans needs to be on EVERY "Best of the best" list on the internet for backup software. Now.