Change server owncloud

Hello, I have a version of old owncloud, the 7.0.3, the server runs on a FreeBSD 10, what I want to do in question is:
Install a new FreeBSD with version 11 and pass to this new server my owncloud current.
Can you guide me in what steps should I follow to carry out my role ?, I must say that the database and the current storage of my owncloud are external.
Would it be possible to update the owncloud version in the process?

Sadly FreeBSD is not officially supported as a platform for owncloud.