Hehe no, such deletions are not possible in the companies I've worked.

Backups are still done to tapes, I believe it's one of the more reliable methods still.

Then they are stored, often in secure warehouses in different locations, often in old sold out military installations in mountains.

There are usually many errors in novels, movies etc when it comes to tech.

What however can bother me more is when a writer or director does not even know the difference of theory and hypothesis. "It's only a theory" - gravity is a theory.