* bob944 <bob944 at attglobal.net> [2006-08-11 00:09]:
> > That is correct. You MUST have the fulls and incs in the SAME 
> > policy for the incs to work.  Otherwise, they have nothing to
> > compare against and have no way to actually do an incremental
> > backup.
> 
> Correct enough, in the context of explaining NetBackup to the neophyte
> as you and the previous poster were doing.  But the advanced user should
> remember that this is the behavior of the cumulative incremental, not
> the differential incremental.  By definition
> o  full       backs up everything
> o  cum        backs up everything modified since the last full
> o  diff       backs up everything modified since the last backup

That is an important distiction to keep in mind.  Digging further, the          
                                       
5.1 SAG defines a diff as everything since the last full or last diff           
                                       
only, it does not include cumulatives (pg 147).  Subtle, but just as            
                                       
important.                                                                      
                                       
                                                                                
                                                                                
                                                                           So 
many nuances...                                                                 
                                    

-- 
David Rock
david at graniteweb.com