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:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

lciprianionutCommented:
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.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
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.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Exchange

From novice to tech pro — start learning today.