Can I backup to a NAS device?

Yes

NAS devices are supported in specific cases where the NAS drive is presented to the server OS as a local drive. This will normally be achieved by connecting it via iSCSI or Fibre Channel connection.

When considering setting up the vault on a NAS, it's important that it is dedicated for this purpose and not used for multiple different services.

 

NFS connections to NAS are not supported.