Size of Office 365 backups

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Size of Office 365 backups

Veeam Logoby m.novelli » Sun Feb 19, 2017 2:41 pm

Hi guys, I'm running some Office 365 backups and I'm finding that the file/folder size on disk and the email report is quite smaller than expected, smaller by hundreds of GB looking the space reported as used by Exchange Online

Is Veeam Backup for Office 365 doing some highly efficient compression/deduplication during the backup?

Thanks for any info,

Marco
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Re: Size of Office 365 backups

Veeam Logoby Mike Resseler » Mon Feb 20, 2017 7:52 am

Marco,

There are two reasons why this difference can be there:

1. What is your retention? Think about all the emails that are still in Exchange Online but are already past the retention period so they won't be in your database
2. We use a JET DB database as repository. That includes internal compression

Hope it helps
Mike
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Re: Size of Office 365 backups

Veeam Logoby m.novelli » Mon Feb 20, 2017 9:34 am

Ok, I've just realised now what Veeam Backup for Office 365 means as "retention"... I thought it was saving everything, not just the last X years

This particular configuration settings need a better naming / explanation. Last week I've backupped and exported a single mailbox for a customer but just now I've realised that I've saved only the last 3 years

Marco
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Re: Size of Office 365 backups

Veeam Logoby Mike Resseler » Mon Feb 20, 2017 9:43 am

Marco,

Any suggestions? Retention is typically used in this specific scenario. Think about in-place retention which works the same way but we are always open in suggestions that make it easier and better for anyone
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Re: Size of Office 365 backups

Veeam Logoby m.novelli » Tue Feb 21, 2017 4:34 pm

I'm coming from Veeam Backup & Replication, so "retention for 3 years" to me means: take a full backup and retain for 3 years the incremental backups before merging them in full backup and discard them

The "retention" word should be replaced by "save last x years of emails"

My 2 cents

Marco
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Re: Size of Office 365 backups

Veeam Logoby Mike Resseler » Wed Feb 22, 2017 6:14 am

Thanks Marco,

I appreciate your feedback

Mike
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