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Will the windows backup delete automatically the older set if the backup disk is full?

Posted on 2011-09-21
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Last Modified: 2012-05-12
Hello,

Question: I see that i'm gonna running out of diskspace in the Backup disk.
Will the Windows backup automatically delete the older set?

If not what is normaly the process, deleting manualy the older set?
Because i can't see the backup disk in the folder.

I hope you guys can help me with this.

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Question by:xof64
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by:borki
ID: 36572704
Yes, it does. Windows Image Backup performs initially a full backup with all subsequent being incremental backups.

The backup engine automatically manages the disk space and deletes older backups as required. On a drive that has got 50% more disk space than what you are backing up, you typically see 10 to 20 backup sets.

You can check that using the backup history.
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borki earned 500 total points
ID: 36572714
Check this article for more info:

http://blogs.technet.com/b/sbs/archive/2008/11/03/introducing-sbs-2008-backup.aspx

It still applies to SBS 2011, as the backup engine in 2008 vs 2008 R2 has not changed much.

Hope that helps!
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by:xof64
ID: 36572831

Thank you for the information.
But just one this does SBS 2010 Incremental or Differential?

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Expert Comment

by:borki
ID: 36572847
There is no SBS 2010. Internally the backup uses an incremental mechanism. However, when you restore, each backup set will look like a full backup! The first section of the technet article quoted explains it all.
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Author Comment

by:xof64
ID: 36973208
Hi,

Sorry for the delay

Well it's strange, now my backup failed on insufficient space.

Event 521
The backup operation that started at '¿2011¿-¿10¿-¿15T12:20:56.599000000Z' has failed because the Volume Shadow Copy Service operation to create a shadow copy of the volumes being backed up failed with following error code '2155348001'. Please review the event details for a solution, and then rerun the backup operation once the issue is resolved.

Event 51
The backup storage location is running low on free space. Future backup operations that store backups on this location may fail because of not enough space.

I though that the WSB automatically delete the oldest backup



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Expert Comment

by:borki
ID: 37552710
Sorry, did not realise you posted more info. Did you resolve the backup disk space issue. Typically, this issue arises when you are backing up more data than you have disk space. Example:
Your combined disk space that you backup is 410GB
Your backup disk is 500GB (formatted 465GB) and has 5GB free
You have 11 Backup sets on the disk:
- The inital set, 410GB
- 10 Incremental sets, each 5GB = 50GB
- Total space use 460GB
- Your new incremental backup set would is 60GB (you may have re-indexed a DB)
In this scenario, even if all incrementals are deleted the new backup can not be stored on the disk.

Best option is to re-format the disk and create a new, full backup.
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