Removing yourself from the internet is not always an easy task and the biggest problem is tracking down all your online accounts so you can delete them. Just Delete Me is a site that provides you with direct links to doing just that.
Two-factor authentication is one of the most important things you can do to protect yourself against getting your accounts hacked, and you should enable it now if you haven't already. Instead of using a text message, though, Authy is our favorite two-factor app on the block.
Back to basics: The three easiest ways to back up your files