I'm afraid that you're going on to expose part of the underlying problems. 100,000 individually built, individual managed servers are likely to suffer 50,000 catastrophic failures for dozens of different reasons, ranging from lost passwords, accidental deletion with no snapshots, hardware failures, breakins due to incompetence such as using FTP, breakins because they choose terrible passwords, and others. These are _precisely_ why so many people are going to cloud services
Frankly, many of the "just ask around" answers you'll find even from technical friends, are horrible and have profound consequences to the safety or reliability of your data. I make quite a bit of my own salary helping companies clean up the results of technologically skilled admins. Many of them didn't bother, or didn't know how, to run real backup services and the results are devastating.