This Thursday is the day! Yes, it is World Thinking Day (which you should still definitely do), but it's also the day that Australian Government agencies - and other organisations with obligations to secure personal information under the Privacy Act 1988 have to let you know if there's been a data breach that is likely to result in serious harm.

That's right, they didn't have to before. Now if they don't, they could be fined up to $2.1 million.

Here's everything you need to know.