Exchange Full and differential backup

We use Netbackup for Exchange serve 2010 , to backup the databases.
we do the Full backup on Saturday which spans through Sunday. We do the Differential through the week days.

Now if I understand differential as well as Full backup should purge the logs.
however, when I go to Netbackup console and Try to restore, if I select the full backup, and expand the database to restore, I will see the Name column: database and Logs _xxxxxxx
xx=are bunch of numbers

If I select just a different backup to restore then I will see under Name column : Logs _xxxxxxx
xx=are bunch of numbers

My confusion is, I thought Full backup and Differential will purge the logs when the backup operation is completed

Any help will be very much appreciated.

Thanks
jskfanAsked:
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florin_sCommented:
this link describes what you are looking for: http://msdn.microsoft.com/en-us/library/aa579399(v=exchg.140).aspx
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ReceptCommented:
Can we please get more information about the environment? Are you backing up a passive copy of the database?
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jskfanAuthor Commented:
we have a DAG with 2 members.
each member has 8 databases active and 8 passive.
the 8 active databases on one member are passive in the other and vice-versa

so we back up just the active databases
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florin_sCommented:
Hi,

As I understood you look from the backup tool at the logs, but what about if you look on the system log partition, do you see the old logs there after the backup was run?
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jskfanAuthor Commented:
to my understanding Full backup operation , when it is done, even if there are changes in the database that occurs right after the full backup was done, they logs will not be backed up until the next scheduled backup runs.

in Netbackup restore, all the databases have a log file displayed under it...
I am not sure why?

I have used Commvault in the past, when you restore a full backup, you see just the database.
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jskfanAuthor Commented:
Ok..I was confused...

When the full backup operation is done on the database, the logs that are purged are the ones that are on the disk....but the back up will still have the logs that got backed up along with the database.

most of the full backup we have they show one Log file along with the database...it could be that circular logging is used....

....I need to find out
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jskfanAuthor Commented:
Thank you
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