

I enjoyed the depth of this answer. That being said…
4 copies seems like a level of paranoia that is not practical for the average consumer.
3 is what I use, and I consider that an already more advanced use case.
2 is probably most practical for the average person.
Why do I say this? The cost of the backup solution needs to be less than the value of the data itself x the effort to recover the incrementally missing data x the value of your time x the chance of failure.
In my experience, very few people have data that is so valuable that they need such a very thorough backup solution. Honestly, a 2$ thumb drive can contain most of the data the average user would actually miss and can’t easily find again scouring online.





It all makes sense if we remember that the garden variety AI we have today (ChatGPT, etc) are nothing more than fancy models that predict which words typically appear one after the other in books and reddit posts.