KeepSafe protects your important documents and data with a seamless and real-time backup solution. It does not backup your entire system, but focuses on the documents and files you work on so you can quickly recover in the event of a file corruption, lost document, etc.
KeepSafe offers protection on a wide variety of file types which can be easily configured using wizards, and gives you statistics on your backup data.
Existing users can update via Impulse, and KeepSafe is available for $19.95 for a limited time.
Link: KeepSafe 2
Download: KeepSafe (Free trial, $19.95 limited time)