Only a sith deals in absolutes.

Realistically, it could be done, the problem is all current cloud providers only invest in backups and maintenance as far as it makes them or helps make them a profit.

A well-run well-funded public option would be far better than the current situation. Yea, crisis's can and will happen, but to me to qualify as "well-run" it would have to have established and practiced procedures and contingency plans for such things. Perhaps a "globally funded and run" public option so that no singular political upheaval or natural disaster in certain parts of the planet would be able to significantly affect things.

Hell, with enough funding we could even have a daily batched "moon backup" so even in the case of a total global disaster, there's still something left.

Conversely, it would be far more likely for Grandma to lose data when compared to a "well funded well run" public option. Grandma may or may not have invested in the proper 321 backup strategy, or even tested them, or stored them properly Grandma may very well have just tossed em in a box in a hot and humid attic. Any ability to retrieve what you wanted from Grandma's box of tape backups would be entirely on luck and fate.

That being said, at the end of the day, we have to get one of those promising "permanent" storage technologies to hit mass production (Like the ceramic or glass storage medium or the DNA based one) if we want any hope of actually preserving our digital data in a way that will stand the test of time and lack of maintenance.