How to transfer the functionality of a WP site to a self-written CMS in the future while maintaining the structure and content?

Question

CMS

I am currently doing a startup project on CMS WP due to lack of budget;) But in the future, when the project starts to feed, I will certainly think about ordering a full-fledged development, my own servers, and so on .
Tell me, will it be possible later to make a complete copy of the site while maintaining the entire structure, functionality, content and assemble your site with the latest science and technology with a self-written admin panel;)) and painlessly replace it?
Now the project has more than 40 plugins and I think there will be more)) I have not done optimization yet. I need to comb it, finish it, and then I’ll optimize, speed up, replace some of the plugins with clean code. But, am I on the right track?
Can I then repeat this creation "one to one"with better and more modern code?
The site turns out to be large, all over the Stavropol Territory: https://v-26.ru
I chose WP as the most convenient CMS to create whatever I want))

Answer 1

Easily.
The main thing now is to think over a normal CNC, so that later it would be more convenient to redo it.
So that there are no internal WP links, ala /wp-feedback/ %)
And the rest is just a matter of money.

Answer 2

Can I then repeat this creation "one to one" with better and more modern code?

No.
VP has been developed by a hundred (if not a thousand) specialists for more than a dozen years, but is someone thinking of making it "better" alone in a couple of months? :) Oh well.
STAGE FIVE! :)) Means joined the company of rogues: CNN, MTV, Forbes, Nokia and others .

Answer 3

Look up what .CSV is