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Backing up Compressed Files with Backup Exec

Created: 24 Oct 2012 | 8 comments

Hi

Hope someone can help me, I have a machine where I have used windows compression on some data it was nearly 1Tb which has been compressed to 291gb. Since compressing the data my back up Job rate has dropped from 2,500 MB/min to between 665 and 1,188 MB/min.

 

Does Backup Exec not like compressed data? Are there any changes I can make to Backup Exec?

 

 

Cheers

 

Cass

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CraigV's picture

Hi Cass,

 

BE doesn't mind compressed data, but if you're backing up compressed data and have Compression turned on on your backup device, it can cause some issues, including inflating the compressed file.

Check to make sure that Compression is turned off on the device and try again.

Thanks!

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Loscassidy's picture

Hi Craig

 

So if I change the backup method from Full - Using archive bit (reset archive bit) to copy files?

 

That will fix it?

 

Cass

 

 

CraigV's picture

Nope, not necessarily. Go to your device within BE and then to its properties. Turn off Compression there (if enabled).

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Loscassidy's picture

ok cheers, is this the best bet or am I better just buys a bigger disk drive and uncompressing the data ( windows) and just letting BE compress it

 

Cass

CraigV's picture

Well, turning off compression on the drive to see if this affects the job speed is a cheaper alternative than buying a new drive.

Are you perhaps also scanning the BE services with an AV? If so, turn off active scanning as this can also have a negative impact on backup speeds at times.

Thanks!

Alternative ways to access Backup Exec Technical Support:

https://www-secure.symantec.com/connect/blogs/alte...

sbora's picture

In the backup job you can disable the compression (set compression type to none). Do not disable the compression on the device as that will disable it for all backup jobs.

 

Larry Fine's picture

I would assume the performance hit is due to the Windows overhead of decompressing your files before Backup Exec gets them.  When things are compressed on disk, the application (Backup Exec) is unaware of the fact that they are compressed.  So it doesn't matter if the application requesting the file is Excel or Backup Exec, the fact is that Windows has to decompress the file as it is accessed, which hurts performance.  If there was no performance hit, wouldn't everything be compressed by default?

If you had zipped up your files, then I think the other comments about double compression (zip and BE) would come into play.

Might your bottleneck be your processors when running backups?  http://support.microsoft.com/kb/251186

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