Why you should backup data?

There are 2 cases about data lost.

• Lost $400k USD in a deleted email, how contact a Gmail engineer? https://news.ycombinator.com/item?id=14452969
• I Threw Away $4.8 Million In Bitcoin https://www.gizmodo.com.au/2017/05/i-threw-away-4-8-million-in-bitcoin/

To consider using the http://sia.tech/ service, it's a 'Your decentralized private cloud'.