The operating system my web server runs on is (include version): Windows Server 2019
I need to export all certificates including keys from one server to another. Is there a way to do this simply and including all certificates at the same time?
win-acme's migration instructions are here: win-acme
For a mass migration I would suggest performing several test migrations before attempting it on production servers. You're not just moving the certificates and restoring IIS bindings, you need to setup your certificate renewals again otherwise your cert will begin to expire.
Depending on how your sites are setup you may be able to move sites in batches rather than one giant migration.