Personal Cloud??? Now they are just making #%^$ up!
One of the major benefits of "cloud computing" is having it managed by someone else and that it is always on and always available. If I have to manage the system myself (backups etc.) and can't put my notebook to sleep when not being used etc. or if I have to reconfigure everything again if I change that "host" computer, then it really isn't cloud computing.
Depending on your router, you can currently wake up your home computer remotely if you configure it so. Being able to access your home computer, even when it's sleeping, doesn't seem so far-fetched.