speeding up my websites
3) importing the occasional landing page

I read through all your answers and such, but to be honest, I am still not getting if I can do what I want to do, since it seems to be very complex.

My questions:

1) Can I import my website to your interface, and then "export" it again to my website. It is well documented and easy to get my site onto your dashboard, but I don´t find anywhere the opposite (and I really don´t want to use your hosting, I am fine where I am). I also saw that you offer a plugin for speeding up the website - does this have anything to do with this offer?
2) If 1) is easily possible, would I still be able to using Gutenberg, or would I be forced to use your "Elementor" substitute (which I don´t want)
3) If I use the backup function, where would my data lie and would that cost something?
4) When importing a page, I´d like to use the same headers and footers as all my other pages - this seems to be rather complicated as the new page is not part of the structure (menu) of the old site, right?

Thank you for clarifying!

Amin