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Windows Server 2008 Backup and Defrag - Possible Conflict

We are using the native Windows Server backup on SBS 2008 and also schedule a defrag once a week on the server drives. This does not appear to cause any problems but I have read that because the defrag rearranges blocks of data on the disk that it can increase the size of the incremental backup images. We are using external HDDs which are rotated offsite and are not using any form of cloud backup. I would be interested to know if there are any possible problems with this.


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Haresh NikumbhSr. Tech leadCommented:
If Defrag is configured then yes it will create large Size of the snapshot, but question which you have asked is it will conflict with backup.. ( Normally it should not ) only  make sure  both job should not get run at a time. you can schedule Defrag job when backups are not running.

Most of the Cloud backup company do not recommend to configure Defrage for the server which has configure for backup .. then reason is it create large snapshot.. and take lot of disk space to store backups.
Tony GiangrecoCommented:
I agree with Takecoffee, your backup file will increase in size, however for performance and peace of mind that your backups are performed properly, you should make sure the defrag process does not run while the backup is running. It could cause a delay in the backup finishing and also a conflict between the two processes.

If you run your backup in the evening, I'd suggest scheduling the defrag to run on Saturday or Sunday mornings when there is reduced user activity. Like every Sunday at 4AM.
Gerald ConnollyCommented:
If you are using light snapshots then its quite probable that the defrag will increase the size of the snapshot but only if it runs while the snapshot is live.

Will it make any difference to the backup? Its very unlikely, its only fiddling with the way a file is laid out on disk, not its contents, so it doesnt change the state of the file header and therefore an incremental backup will not be triggered.
Tony GiangrecoCommented:
Have you rescheduled the defrag and tested the backup?
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