So, you are on Facebook 24/7, you store your photos, you add long lost friends, Private Messages, you have a set of Pages you have liked, What if for some reason your Facebook gets Hack, how to do you retain the data?
1. Go to Account Settings
2. Find a Link that says Download your Information, Click on learn more
3. Wait for an e-mail that will let you know your info is ready (it takes a while, what with all the stuff you probably have on Facebook)
4. Go through the security test that allows you to download your information, Voila!
P.S.: Do this before someone Screws up with your Facebook Account