You can get it for free. Here’s how:

Sign in with your Google account and review your security settings. It’s simple as that. But do it today — this is a one-time offer.

Today is Internet Safety Day, and Google is using the storage space as an incentive to get you to spent the two minutes it’s going to take to keep you safer. Click this link, and then update /check your security settings. After you’re done, you will receive an automatic update on your free storage earnings.

NOTE: I just completed this. It took a couple minutes.