You never know what's going to happen on April 1st, right?
Some reddit users thought it would be a good idea to avoid as much destruction as possible :), and suggested establishing the World Backup Day on March 31st in order to secure personal data, such as work documents, photos, videos and music, against naughty drolls. The initiative was soon turned into a global flash-mob supported by a number of developers who create backing-up software and hardware.
So, apart from saving reminiscences about the precious moments of your life, you can win various prizes by participating in the program. Learn the details on the official website or on the Facebook fan page.