System backup tool for OpenERP

I've just published a new module in community addons

This is a system backup tool that can be run from the OpenERP
user interface. It is meant for system administrators.
It doesn't do the backup itself but provides a convenient
framework to run python backup scripts. There are several
example scripts provided that can be run outside OpenERP
so they can be easily tested.
Backup scripts are called Tasks and they don't do device
mounting and unmounting but that's provided by the scripts
in the object Target.
The result of a backup operation is called a Job. There are
tar and rsync kind of jobs supported.