Description of problem:
Please allow the user to set a level (niceness) that the backup job will run at.
Version-Release number of selected component (if applicable):
You might want to actually hide the "niceness" value itself and abstract it to
textual representations of the priorities, ie. Lowest, Lower, Default, Higher,
I don't think most people need (or care about) 40 levels of granularity (oh,
btw, it goes to -20 to 19 :)