A personal data breach is likely if there is 'a breach of security leading to the accidental or unlawful destruction, loss, alteration, unauthorised disclosure of, or access to, personal data transmitted, stored or otherwise processed'.
If you experience a breach you are legally obliged to report it to the ODPA if the breach is likely to pose a significant risk to the person (or people) whose data has been affected.
It's important to remember that breaches can occur in all sorts of ways (it's not all about sending an email to the wrong person).
Here are five common breach scenarios and how you can avoid them: