IBM TSM : My exchange database size is 4,4TB, but tsm backed up 6,4 TB!

Hello experts,

I am having an issue that I dont understand with my TDP for EXCHANGE.

In fact my exchange backups size was 6,4TB (1 Full backup + Incrementals), but following an incident on the tsm application, I had to delete all my exchange backups and do a full backup of the exchange Databases.

I found out that the new total size of the database backed up is 4,4TB instead of the 6,4TB.

I don't know how to understand this, how can I avoid this type of issue?
Williams225System AdministatorAsked:
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It was 6,4TB because of 1 Full backup + Incremental(s).
Now you did only a full backup which is the size of the Exchange DB and because of this you have 4.4.TB only. If you will do any incremental, the size of Exchange DB on your TSM server will increase also.
This is normal. Of course with time and depending of type of backup you are doing backup size on TSM server will increase also.

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Williams225System AdministatorAuthor Commented:
what do you recommand? what is the best management class configuration to have only 1 full back ups and few incrementals (max 10 incrementals),
AmitIT ArchitectCommented:
Best practice is to take full backup everyday. Or You can take full on every Sat or Sunday and rest incremental.

You can also run Exchange without backup. Sounds bit crazy, however with DAG that is easily possible. I am running several clients without any backup. Even MS run Office 365 without backup.
Williams225System AdministatorAuthor Commented:
Wow i can't take full backups everyday , it takes  3 days  and half to do a full backup of my exchange databases
AmitIT ArchitectCommented:
That's why I said, you can run without backup. I have 37 TB of data. With 5 copies and DR site, no backup, using db retention setting for email and mailbox restoration.
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