How to move from cloud to private server

Hello people, we plan to do initial development on the una cloud server and at some point we like to move to our own server.

Is there documentation about this process? We have some considerations like:

Can we potentially go live from the cloud and then migrate to our own server? Or is it better to migrate first.

Is migration bigger than a simple db export /import? How much time does it approx take?

Is all our development stored in the database, or also in code files? Do we need to ftp the code from the una server ?

Thanks for info BiB