Server wijzigen naar een setup met twee containers

I have one server with one container installation.
I need to change hosting and test updates / bew feature before releasing in production installation.
So i decided to

build a local instance with two container.
Test the migration. (Online server —> local staging)

Then I’ll buy a new server.
Migrate my discourse to new hosting
And keep local staging server to test.

Sorry if I made too many questions.