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Failed to open data stream

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Occasionally I get the message "Failed to open data stream" and at the end of the report "Operation has completed with errors." The attached zip file contains a screenshot and the full report. However, a backup has been created and seems to contain files, though obviously I can't verify that it contains all the files it should.

Any suggestions as to what is causing the message and what I might do about it?

Attachment Size
2012-11-16_backup_failure_log.zip 295.45 KB
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Failed to open data stream can happen when ATI loses track of the backup files. This could be caused by a network interruption, by some change in the drive letter (if the user didn't assign a fixed one to the backup drive).

When connection issues are ruled out, the best thing to do is to delete the backup task and to create a new one.

I agree with MVP Pat L, you should create a new backup task.

The errors you have reported show the backup file being created successfully, but there is an issue with Acronis trying to do a consolidation after the backup file is written. The log shows that the file is in use by another process (could even be Acronis not releasing control/unlocking the backup file after creating it).

I have completely lost track of the number of new backup tasks I have created over the last two years in response to backup failures of one sort or another. Mostly I have been trying to backup to a network drive and I came to the conclusion there was a problem with that so bought a USB connected external hard drive, which, initially, seemed more reliable.

The backup task is the whole of drive F: (on my hard disc in my PC) to G:/back-up (on the external hard drive). I manually trigger it every few days. I use DropBox for the most critical data, which I keep in F:/Dropbox.

I also have installed "Allway Sync". I have a job set up to synchronise the whole of my F: drive to G:/Copy of F. It's a one way sync so that I have copies of files I've deleted (from F:). I have automatic synchronisation switched on to run when the computer has been idle for 10 minutes.

Could there be a conflict?

Make sure you assign a fixed drive letter to your USB backup drive, late in the alphabet. This will make backup more reliable if you tend to plug or unplug devices to your computer.

I have the same problem with "failed to open Data Stream". I have tried everything to solve the problem, including the "repair" download. I have been using ATI since 2011 and know how to use it. This problem seems to be common with users.