i just did a (standard docker install) forum migration yesterday from one ubuntu 24.04 LTS server to another located on the other side of the planet, and using exactly the steps Falco suggested. i also switched transactional email services at the same time. i think uploading the backup to the new site was what took the longest. the migration itself was relatively easy - just restore to the new forum. i set the DNS TTL to 5 minutes on my name server, and as soon as the domain was verified i did the switch over to the new host server i had already setup.