The HP MediaSmart EX490.
The size of a small toaster. Windows Home Server = All the awesomeness of Windows Server 2003, all the incredible awesomeness of Server 2008R2's backup mechanisms + ease-of-use so good you'd forget the box existed if it didn't have cool multicolor lights you could program.
Four hot-swap toolless drive bays. (I have the stock 1TB drive, plus three 1.5TB drives internally)
One eSATA port supporting multiplexing for up to 5 external hard drives in one enclosure. (I have an enclosure with one 2TB drive to back up the box)
Gigabit ethernet for lightning-fast backups
Supports bare-metal backups of Windows and Mac systems. Already tested this when going from a RAID-1 to a RAID-5 on my main desktop rig at home, and it works --with Windows 7 x64 Enterprise.
Supports media-streaming, iTunes-serving, and a ton of other great things.
Supports folder-duplication, which shadow-copies your files so that if one drive fails, you're still okay.
Have owned this since just before Christmas --and it is da bomb.
P.S. Hi all --Good to see yous guys again.