EMC NetWorker discussion <NETWORKER AT LISTSERV.TEMPLE DOT EDU> wrote on 
02/20/2008 03:15:35 PM:

> 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.

Yes, I know. What I don't know is why NetWorker doesn't make it easy and 
just have those as pre-defined levels ... they are standard terms, after 
all ... I always disliked incrementals - too many restores to get back to 
where you need to be (to recover all files). 
For non-"recover everything" situations, it's a different story. Then, if 
someone says "I need the file as I edited it on Tue, because on Wed I 
changed it wrongly/deleted it", either incremental or differential will 
get you what you need (i.e., thye file as backed up on Tue after the 
change).

> 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)

I'm a Windows Admin, too (for the most part), and I understand the 
concepts easily enough. NetWorker is a different story. :-)

> 
> 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>
> 
> To sign off this list, send email to listserv AT listserv.temple DOT edu 
> and type "signoff networker" in the body of the email. Please write 
> to networker-request AT listserv.temple DOT edu if you have any problems 
> with this list. You can access the archives at http://listserv.
> temple.edu/archives/networker.html or
> via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER
> 
> To sign off this list, send email to listserv AT listserv.temple DOT edu 
> and type "signoff networker" in the body of the email. Please write 
> to networker-request AT listserv.temple DOT edu if you have any problems 
> with this list. You can access the archives at http://listserv.
> temple.edu/archives/networker.html or
> via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER

To sign off this list, send email to listserv AT listserv.temple DOT edu and 
type "signoff networker" in the body of the email. Please write to 
networker-request AT listserv.temple DOT edu if you have any problems with this 
list. You can access the archives at 
http://listserv.temple.edu/archives/networker.html or
via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER