search for: new_server_username

Hello, I've done a fair amount of searching, and couldn't find a definitive answer. I am moving my dovecot/postfix servers and mail in Maildir formats to a new host. When I move the Maildir directories, what should I do with the dovecot.index/cache/log/etc. files? I know I can filter them out, and dovecot will recreate them, but is that the best approach? I am thinking of the following: