What customizations have you made? AFAIK NAV is a deploy and forget with inventory getting the information and making updates as needed
If you create application definitions or customize unknown services, this information is saved in VIN database. If you loose you VIN appliance or want to redeploy, you lost all apps definitions and customized services. Or, what if i want to reuse all customized services in another vsphere infra ?
Thank you for your questsions:
1. Can you backup and restore a VIN backup, so you don't loss all your services and application customizations ?
There isn't a way through VIN to backup your customizations. You can contact GSS in order to get help in doing these type of actions through the VIN VM itself.
2. Can you export and import all your services and application customizations to different vcenter infrastructures ?
Likewise, this cannot been done directly through the VIN UI and you would need to contact GSS in order to receive assistance with such a procedure.
3. Is there a document that explain a bit more about vCOPs and VIN integration and coexistence ?
You can find information regarding the integration between VIN and VCOps here: http://www.vmware.com/pdf/vcops-vapp-56-deploy-guide.pdf on page #9
Hope this information helped