BitTorrent Sync already offers the safest and most efficient way to sync data between devices. We’re now introducing our support of network-attached storage (NAS) devices to offer BitTorrent-built Sync apps in vendor storefronts; creating a simple path to access and transfer your data from the NAS to a desktop, mobile or other NAS device, whenever and wherever you need it (and we mean all of your data, not some of it: without limits or storage fees).
They are already partnered with Netgear. This looks like a great solution for people without a server or always-on computer to sync with. The entry-level NAS is only $166 with no drives on Amazon. I've been using BitTorrent Sync for quite a while and have been extremely happy with it.