rsync

Synology Disk Station 4-Bay 2 TB (2 x 1 TB) Network Attached Storage DS410j 2100 (White)
$599.99
Synology Disk Station DS410j, bundled with 2x1TB HDDs, is designed to provide a cost-effective file storage and backup solution with RAID protection for multi-user home environments. The system firmware, Synology Disk Station Manager 2.2, delivers rich features for multimedia enjoyments, worry-free backup, Internet sharing, and energy-saving options.

Synology Disk Station 4-Bay 4 TB (4 x 1 TB) Network Attached Storage DS409 4100 (Black)
$1,054.99
I had a friend recommend another NAS type to me, but when I read thru the Amazon reviews, I couldn't go for it. In fact, if you search on NAS at Amazon and then look at the feedback, you'll find that most of the NAS vendors have terrible customer service. I literally picked out my NAS by reading Amazon reviews. Synology was about the only company that people weren't ready to tar and feather.

I'm happy with my purchase. With 4 1TB drives, it draws about 18-20 watts when idle. Maybe 35 when busy. They have a built in timer system to shut it down at a selected hour and then reboot it back when you choose. It's quiet. It can do all sorts of stuff (email server, web server, DLNA server, etc.). I can write to it at 30 MB/sec and read back at >50 MB/sec. Biggest key is that they have a very active community and forums and the customer service people actually seem to care about problems.

I've only owned it a month and haven't really encountered any issues. I'd give it 5 stars if I'd owned it a year and it continued to work as it is now.

Synology Rack Station 4-Bay 4 TB (4 x 1TB ) Network Attached Storage RS409 4100 (Black)
$1,473.99
Synology Rack Station RS409 is designed to provide users with a flexible solution to share files and increase productivity. Its high performance coupled with sophisticated Synology Disk Station Manager 2.1 provides an ideal solution for cross platform sharing, secure server backup, Windows ADS integration, business mail server, and corporate surveillance. Protocols: AFP 3.1, AppleTalk, CIFS/SMB, FTP, FTP over SSL/TLS, HTTP, HTTPS, LPR, NFS, RSYNC, SSH, Telnet, UPnP, Windows ADS. Management: AJAX-based Management UI, Applications privileges Setting, BitTorrent DHT Support, BitTorrent Port Range Setup, CIFS Recycle Bin, Download Station Bandwidth control, Download Station Port Range Setup, Editable HTTP Error Page, Email Alert Message, Email Notification for New User, External HDD Hibernation (eSATA, USB), Ez-Internet, Firmware Upgrade, FTP passive port range, Hide-able Shared Folder, Internal HDD Hibernation, Link Aggregation, Movable Shared Folder, Package Management, PPPoE, Removable Default Shared Folder, Scheduled Power On/Off, Sub-folder Privileges Setting, System Temperature, UPS Management (Over USB 2.0), User Home, User Quota, Web-based Download Station 2 Now with 4x1TB HDDs

Synology Disk Station 4-Bay 1.28 TB (4 x 320 GB) 2.5 Inch HDD Network Attached Storage DS409Slim 4030 (Black)
$949.99
Synology Disk Station DS409slim is designed to provide users with a budget-friendly solution for easy file sharing and backup. The snap-in 2.5¡É hard drive design brings low power consumption, quiet operation, reliability and easy disk replacement in a compact design. Its software, Synology Disk Station Manager 2.1, delivers ease of use and variety of features. It is designed to work with 2.5¡É hard drives. The low power consumption characteristic of 2.5¡É hard drives will lower your electricity bill, as well as reduce your carbon footprint. The smart fan design keeps the fan off under normal operations and spinning up at a very low speed only when needed, thus minimizing the noise level. In addition, 2.5¡É hard drives have reduced vibration, increased MTBF (mean time before failure), and shock tolerance. Synology Download Station 2 functions as a 24x7 BitTorrent, FTP, HTTP, eMule, and NZB download center. Synology Audio Station supports music, Internet radio stations, and iPod playback with connected USB speakers. An optional direction-free Synology Remote allows you to freely enjoy your music. Web-streaming mode allows your music to be shared with multiple users over the Internet. UPnP support allows users to stream multimedia files with an UPnP Digital Media Adapter (DMA) on a stereo system or a TV-set. Sony PS3 and Microsoft Xbox360 are also supported. iTunes Server is an easy way to share music to other iTunes clients over the network. USB Copy provides a plug-n-save solution to store data. Synology Data Replicator 3 allows Windows users to back up desktop data to the DS409slim. Users can select immediate, sync, or scheduled backup according to their needs. The Network Recycle Bin ensures all deleted files are recoverable from the recycle bin. Synology Photo Station 3 simplifies photo, video, and blog sharing over the Internet. Customized themes and various selections are available for personalization. Now with 4x320GB HDDs