I need to set up a site to site VPN, to allow a client to back up his office computers to a NAS in his home, across the Internet. We haven’t purchased the NAS, nor routers, yet. I’m looking for a recommendation for the brand, and even the model, of router, or routers (or firewalls) I’d need to accomplish this. I know that some NAS-es feature a VPN server (QNAP does, anyway,) but I’m not clear that it would be appropriate for a site to site always-on VPN. Please address this topic, too. Thanks!