Rebaking posts is typically used to reprocess a volume of posts. For example you changed your Domain name. You now have a large number of posts that link to other topics on your site. They are now broken.
So you use the appropriate rebake process command to replace the old domain name with the new one.
From my understanding since you are just moving from one server to another no rebaking should be required. You will need to update the IP address info pointing to your site in domain provider from my understanding.
The link below should help to give clarity on rebaking posts