With regard to backup of tenant workloads, they are vsphere VMs and NSX edge VMs and backing up vsphere, NSX should take care of that.
The overall backup would look like
1. backup vio config and db
2. backup vsphere
3. backup nsx
At the moment there is no DR solution built into VIO for the infrastructure or the tenant workloads.
Just curious, what kind of workloads are these?