If you want differential or cumulative incrementals (i.e. every
incremental backup contains changed data sine the last full), use level
9. This means on a full system recovery, you only need the full tape and
the latest level 9 tape. You also have to realize that your L9 backups
will get larger every day, depending on the amount of change.

One reason I like L9 is because I can specify a 3 day rotation on
offsite clones (cloning is done daily). If you did an incremental
something other than 9, the offsite rotation would be much more
difficult to manage.

-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of tkutil
Sent: Friday, April 04, 2008 10:34 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] Explain Backup Levels

I am trying to understand the differences in backup levels. I have
always done Full and Incrementals. 

According to the NWadmin guide:
Incremental - Backs up files that have changed since the last backup,
regardless of level.

level 1 - Backs up all files that have changed since the most recent
full backup (considered a level zero).

If I run a Full and then 6 level 1 backups is that the same as running a
Full and 6 incrementals.
F 1 1 1 1 1 1 vs. F i i i i i i

or does running Level1 capture more changes as the week goes on. So for
example after running a full the Level 1 captures changes made on a
Monday when the backup is run Monday evening. Then Tuesday another Level
1 backup is run Tuesday evening and caputures Tuesdays changes as well
as Mondays?

I'm trying to understand what is the best way to capture only changes
made the day of the backup.

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