Comodo Time Machine

Comodo Time Machine (CTM) is a powerful system rollback utility that allows users to quickly restore their computers to an earlier point in time. CTM 'snapshots' are a complete record of your entire system (including the registry, critical operating system files and user created documents).
Layered Security

    * Schedule automatic snapshots to be taken at regular intervals
    * Roll back to the last known working state in the event of virus attacks or crashes
    * Take snapshots of your computer before large installations or system maintenance

Comodo Time Machine is downloadable at http://www.comodo.com/home/data-storage-encryption/data-recovery.php.

However, please note that Comodo Time Machine does not support a system with more than 4 hard disks.