Let's say one of the biggies you rely on today (???gle || ?ahoo || ?ing etc.) suddenly goes titsup/implodes and all of their services you are accustomed to use daily such as storage, search, calendars, social networks, online services, photos, music, videos etc. go dark forever with no prior notice? What will you do? Do you have a (service and/or data) backup plan? What is it? How easily could you rebuild your online world again somewhere else?