Is there any way to save Tapped Out so I don’t lose everything?

I’m a huge fan of the game and have played it for 10+ years. Is there any way at all to make it offline where I can just have the entire game downloaded on my PC or phone and just convert cash to donuts and donuts to cash for eternity? I just hate to see everything I built be taken away. I’d be willing to pay just to have an entire hard copy of the game on my computer..