[plug] imaging HD

[Craig Ringer]

> For some platforms, there are no-cost/included tools that can assist 'on
> the fly' backups by creating a snapshot of the filesystem.

Do-able with linux, however the stable 2.4 series needs several patches 
and you need to install additional tools to get it working. I believe 
the project in question is called EVMS and most of the functionality 
will be included in kernel 2.6 as standard.

Craig