SCALEO Home Server

Here is a Home Server from Fujitsu/Siemens. Here's what I liked the most:

• Energy saving
  
  • “always available” instead of “always on”, that means you decide when your system wakes up for backups and therefore it is energy saving
    
  • Windows® Home Server Power Management to control the daily backup-time of your SCALEO Home Server

I'm rather curious about this "always available" mechanism. Is this wake up on LAN, or timer based?