Here's why you back up your data

Lawrence has a very good overview of the attack that took down Amazon Web Services.   Him summary really gets to the heart of the risks that we face online:

The modern Internet is decentralized, widely distributed and pretty efficient, but its very decentralized nature means that there are more moving parts to break, and also more attack surfaces for hackers to exploit. Delivering rich content over the Internet (be it text, images, video or shopping) usually involves dozens, if not hundred of software pieces, protocols, companies, etc. for every web page served up. Any of them can go down. Network engineers design in as much redundancy as possible, but there’s only so much you can do. I worked for a company in 2020 whose computer testing lab went down because antifa rioters in Minneapolis physically destroyed a fiber optic cable.

All I can tell you is to keep multiple rotating backups of your most valuable data, because anything that can go wrong eventually will…

Yup.  This is why you back up your data.