On 02/11/11 11:43, David Noriega wrote:
> Why is there both incremental and differential? I thought they were
> mutually exclusive.

No, not at all.  Why would you think that?

Here's how the levels work:


FULL - Back up ALL files, regardless of modification date.

DIFFERENTIAL - Back up all files created or modified *since the last
FULL backup*.

INCREMENTAL - Back up all files created or modified since the last
backup *at ANY level*.


So, if you run a Full backup on January 1, then run Incrementals every
day, and on February 20 you have to do a restore, you will have to
restore the Full backup and every Incremental since January 1.

However, if you add a Differential backup every week, then you will have
to restore only the Full backup, the most recent Differential, and the
Incrementals since that most recent Differential.  What the Differential
basically does is "roll up" all the changes up to that point since the
last Full backup.


-- 
  Phil Stracchino, CDK#2     DoD#299792458     ICBM: 43.5607, -71.355
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         Renaissance Man, Unix ronin, Perl hacker, Free Stater
                 It's not the years, it's the mileage.

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