What worked for me was simply doing the following in order:
- Shutting down Octopus service so that no transaction going through.
- Copy the raven database (usually stored in Program Files\Data) to your new server.
- Install the new Octopus server and during the setup, in the Storage Tab, specify the location of your data location copied in the second step above.
The Octopus developer, Paul, mentions the great thing about RavenDB is the installation. It requires no services running like SQL. It's just a copy paste of the data itself and great for installation and portability.