... and as a EU project private alternative to the likes of Dropbox, there's Duple, an app that gives you your full private Dropbox at home. Self-hosted, E2EE, and works just like a Dropbox (currently in beta): https://www.duple.io/en/
What would be the business model?
Come on.
3 copies
2 different devices or medias
1 offsite
If your data isn't that important, then don't.
https://www.us-cert.gov/sites/default/files/publications/dat...
Unless Google/Dropbox/Amazon/Microsoft go out of business, you are not likely to lose data from your backup via act of god (aka data center fire)
B) The simple interface of web solutions is still ultimately that if you want redundancy, just pick 2 (or 3) different providers. Myself - I use Google Drive for backup of my most core files, and Backblaze for the whole shabang.
If you try it, you might find you can protect your data more easily than you can protect most other things in your house if it burns down.