Very Little Risk. You either don't have very much critical data on your computer, or your backup plan is probably adequate.
However, for full protection your data should still be backed up off site.
0-100
Slight. If you experience a non-catastrophic loss of data, you will probably be able to recover from it, but it's going to cost.
101-200
Moderate Risk. The loss of your data from your hard drive may not be recoverable. You are at risk of losing your information.
201-500
High Risk. Any major data loss would be catastrophic, and would probably not be recoverable. Your business and/or personal data is in danger of loss.
Over 500
Extremely high risk. Your backup plan isn't protecting your data. This kind of catastrophic data loss could cause a total business failure.