How do I move the discourse installed server to another server without loss?

[Lilly]

this should have most of the info you need:

Move your Discourse Instance to a Different Server

In this guide we’ll move an existing Discourse instance on Linode (source) to a new Discourse instance on Digital Ocean (destination), but of course these steps will work on any other cloud providers that support Docker. If you are using the same domain name and moving servers, you should set the TTL (time to live) on your DNS entry to a very low value in advance of the change. If you are using different domain names, this won’t matter. Log In and Update Only admins can perform backu…