Bug What happened to Database technology Unity Team?

DB technology has been developed to satisfy the need to organize huge amount of knowledge.
And it is one of the most advanced technologies of our century.
While this is the situation, may I ask you something?
Why my backup process suffers from reading-writing lots of mini mini mini mini mini mini files in my project's library. And it takes hours?
For instance MySQL could store locally or cloud base information. If you combine it with a logic "JUST STORE DIFFERENTIATIONS" Do you know what happens?
My over 200 gb project becomes several gb. It means I can store and back it up anywhere I want. But now it is really really really pain in the back and very huge consideration.
Love you....