Differential accumulates the changes from day to day...so you are backing up 
all the changes on Monday, on Tuesday you are backing up all the changes from 
Monday and Tuesday....etc.  It accumulates all the changes.

Incrementals only back up the changes for that one day.  Monday incremental 
backs up Mondays changes.  Tuesdays backup does just Tuesdays changes.

It took me a while to get that too..but then again, I'm a Windows Admin so I 
don't have the brain power of a UNIX admin. (haha)

Kevin

>>> MIchael Leone <Michael.Leone AT PHA.PHILA DOT GOV> 2/20/2008 2:59 PM >>>
Backup levels are confusing me. Here's what I want - Full backup on Fri, 
differential on Mon - Thu. I use the standard definition of a differential 
- any file that has changed since the last FULL backup.

On my schedule, the full is easy enough. But the description of 
"incremental" - "Backs up files that have changed since the last backup, 
regardless of level. " sounds a lot like differential. Or is differential 
a level 1 - "A level 1 backup backs up all files that have changed since 
the most recent full backup (considered a level zero).". This sounds 
exactly like a differential to me. :-)

So do a do a FULL on Fri, and a level 1 on Mon - Thu? Or is it 
incremental?

Confusedly yours
Mike
-- 
Michael Leone
Network Administrator, ISM
Philadelphia Housing Authority
2500 Jackson St
Philadelphia, PA 19145
Tel:  215-684-4180
Cell: 215-252-0143
<mailto:michael.leone AT pha.phila DOT gov>

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