How is this dif than the countless cloud services you can find out there ?
Most of the cloud storage services that I think you're referring to (dropbox, google drive,etc) are more geared to sharing and device sync. This service is geared towards backing up your files and is more akin to mozy, carbonite, and amazon s3. Most of these services charge either by GB or you pay for a max amount of GB. Crashplan has a fixed price per device scheme which means that if you have many many TB worth of data to backup all on one computer, it is easily the cheapest around. They lack the geographic spread that amazon s3 does, but so long as the server group is in a different region than your original computer you already have geographic redundancy.