Help needed: How to restore vagrantboxes from backup?

Hi there,
I have a filesystem backup of a vagrant installation with multiple boxes from a crashed server.
What steps do I need to do to recreate and launch the backuped Vagrant boxes on a new server?
A simple restore of the directories (.vagrant, .vagant.d, Vagrantfile, etc) does result in the error message: “Volume for domain is already created. Please run ‘vagrant destroy’ first.”

Any help is appreciated
Michael