It's not a too difficult process, and I've tested this in my home lab with OES 2015 & 64-bit NSS as I mentioned earlier in the thread. You can use Veeam's Instant VM Recovery feature to present the backed up VM to VMware. There's no need to power it on though because you can then take the virtual disk for the NSS volume and just attach it to another running OES 2015 server. In my case I couldn't get OES to mount it without a reboot, but in theory that shouldn't even be required. At that point you can see the entire filesystem and restore what you need.
As far as permissions go, we don't restore permissions for NSS. This is true even for 32-bit NSS volumes where we have full File Level Restore capability (no need to do IVMR like with 64-bit NSS). However, what I've done is created a small script that's run as a "pre-freeze" script during the backup job. This means the script is run immediately prior to us taking the VMware snapshot, and that script dumps the trustee assignments to a file using metamig. You can then use that to restore trustee assignments. And keep in mind in many cases you won't have to do this as more often than not inheritance will take care of things--especially if you're restoring individual files. You only have to worry about this if you're restoring a folder where the permissions were previously assigned to that particular folder.
If you'd like a copy of my sample script, feel free to e-mail me at joe dot marton at veeam dot com.