I am not familiar with NS7, i moved in here around the same time as NS8 ;).
Anyhow, restic is restic and if you have the repository files and the the encryption password you must be able to restore any of the content. On NS8 the password can be found in the cluster-admin, not sure about NS7, but i guess it will also be in the UI somewhere.
Maybe have a look over here as well. Restore a single file