Hi Paul,

I understand the difference between a full, incremental and differential backup.

My question point to this:
To restore exchange I need one fullbackup or one fullbackup and a set of 
incrementals or one differential backup.
However, I need one fullbackup. How can I or TDP secure that there is a correct 
set of full and incremental backups to restore from an incremental backup?

Wolfgang

>>> "Seay, Paul" <seay_pd AT NAPTHEON DOT COM> 15.05.02 05:57:10 >>>
Del,
What folks do not understand about TDP for Exchange is that it is just a
vehicle to store and manage exchange backkup objects.  There are 3 types,
full, incremental, differential.  Full backs up everything including the
recovery logs.  Incremental backups what has changed since the last full or
incremental.  Incrementals have to be restore in total one at a time on top
of the FULL to get back to where the failure is on time.  Differential is
all the changes since the last FULL every time you run it.  Nothing is done
with the logs on differential or incremental based on what I know, only on
FULL are they backed up/deleted.

I think I am right on this.  The key is that Exchange just provides an
intelligent object name and pours the data to TSM in that object.  Think of
it as a container.  By having intelligent names the TDP can figure out what
has to be done to restore the Exchange store.

I think a clear explanation of how these TDPs generally work would really
help many people on the list.  MS-SQL is similar.  But Oracle RMAN keeps the
intelligence in its own RMAN catalog.  SAP is similar to Oracle except the
backup information (BKI) file is required to restore the database not the
RMAN catalog.  These are the ones I have researched and studied a little
bit.

Paul D. Seay, Jr.
Technical Specialist
Naptheon, INC
757-688-8180