[CentOS-docs] Added BackupPC Guide

Ned Slider wrote:

> WRT your point above, IMHO major information (potential show stoppers) 
> such as dist or arch specific notes would probably be best included in a 
> note at the *top* of the document rather than the bottom. I'd be a 
> little miffed at reading a whole document only to discover right at the 
> bottom of the page that there is an arch or dist gotcha that applies to 
> me. IHMO if there are clear advantages to running on a particular dist 
> or arch it should be clearly stated up front.

I agree here. Placing notes at the top would be much better than at the 
bottom of a HowTo, that way no one's time gets wasted by reading 
something that doesn't work on a particular arch.

Regards,
Max