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Pau Lo
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online and offline SQL backup basics

I am after an independent view of the following scenarios. There are a number of database (SQL Server) backups being written to the same drives as their live production database. Some of these servers are virtual (SAN storage) and others are physical (local storage).

Our DBA made the following comments:

This is more of a risk on physical servers (local storage) than virtual servers (SAN storage) – can anyone explain why?

They also claimed – if they are backing up the data to tape each night, what’s the real risk? I.e. if the drive housing both the data and backups did corrupt or did fail, as long as they have a backup on tape to which they can restore the backup of the data after the hardware/corruption fault has been rectified – is there really any risk?

What’s your view?
Microsoft SQL ServerMicrosoft SQL Server 2005Microsoft SQL Server 2008

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Last Comment
Scott Pletcher

8/22/2022 - Mon
Vitor Montalvão

This is more of a risk on physical servers (local storage) than virtual servers (SAN storage) – can anyone explain why?
If you loose your physical server you may loose your backups as well. The golden rule for backups is for not store the backups in the same place that your databases are.
For example, where do you store the copy of your house keys? If you let them inside of your house would be useless if you lost the original keys, right?
Pau Lo

ASKER
But if the data is first backed up to local drives, and then backed up to tape - whats the risk? As even if the drives with the live database and backups fail, then you can restore the data from tape?
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John Easton

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Pau Lo

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So all in all if you backup to tape, even if the same drive is housing both databases and online backups, there isnt much risk as you can restore from tape?
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