2012 is starting off early with the announcement of a new OEM vendor for Windows Storage Server Essentials R2:

Backup Box by Gramps is the new OEM vendor.
http://www.smallbizserver.com/store.php

Now before you go... Backup Box by .....huh? Grey Lancaster (aka Gramps) is now an OEM vendor for Windows Storage Server Essentials r2.
http://www.smallbizserver.com/store.php
He will build to suit on either HP's microserver hardware or a single bay foxconn box. Why is this the perfect Windows Storage Server Essentials solution? Well for one it's just plain Windows Storage Server software, no fancy smancy OEM customization to get in your way, and then he keeps the box under the 2 terabyte size so that when you want to make a backup of the OS part, Windows backup actually works (there's an issue if you attempt to backup more than 2 terrabytes in the current Windows setups -- you can't back it up).
It just works. I use it to backup all of the workstations in the office as it supports 25 computers. Whereas in the past I had to have 2 Home servers running and couldn't monitor one of them very well, now I have one unit that just chugs.
Remember what Windows Storage Server Essentials R2 is? It's like Home Server, but it supports 25 computers and supports domain join. Now you can opt to have it not do domain join but honestly I did it because in the SBS console when I domain join the server, it lights up as "online" so I can monitor it better.
http://sbs.seandaniel.com/2010/11/announcing-windows-storage-server-2008.html
Bottom line if you are looking for a Windows Storage Server R2 Essentials vendor, look no farther than one by Gramps.