It is backup system that eats gigabytes of drive space like a black hole. I Turned mine off after 3 weeks and went back to using SuperDuper.
So here is the scenario....
Day 1: You spend all day writing that movie script, the one that will make you a millionaire
Day 1 (later): You make a backup of your system. now you are happy because you have two copies of the script
Day 2: You go back and make some final corrections to your script but for some reason the "Save" function writes a corrupt file back to the disk. Or maybe you tapped the "DEL" key and did not notice you have 175 pages highlighted.
Day 2(later): You back up your system and overwrite the only good copy of the script (the copy you backed on on day one.) But you are happy because you've not yet discovered that you now have two copies of the corrupted file.
"Super Duper" is not a smart way to do routine backups. It has uses but routine backup is not one of them