Backup Failed To Open Data Stream

Hello John!

Thank you for posting. I will do my best to help you.

Failed to open data stream error happens for a yet unknown reasons. The backups location can be a hard drive, NAS or FTP.

The situation needs investigating. Please gather the following data:

1. AcronisInfo report.

2. Wireshark logs.

3. Process monitor logs.

4. A detailed description of your backup settings.

After that  please submit a case with the information attached, and let us know its number.

Should you need anything else or have any further questions - feel free to contact us at your earliest convenience, we will be happy to help you!

Thank you!

Yana,

If it is any help in reproducing the issue albeit in a slightly different way I have found the when a backup is validating what it has just backed up if I increase the disk activity sometimes the validation will fail for the same reason.

I copy backups from a hard drive to a NAS device and if I try to do this at the same time as the validation it will in my experience always fail at some point (does depend on the size of the backup file the larger it is the more chance there is of a failure). Carrying out the validation later shows that the backup set is good as the validation works.

I have virtually the same problem, with a USB external drive, in another thread. After the "usual obvious" things were exhausted, no one has replied. I really want to get past this. If not, I'll go back to 2009 as it worked for many backups with never a problem, same system, same external drive. etc.

Using Win7-64, 2011 build 6703, I created a new task and it ran for two iterations and then failed with the error
"Failed to open data stream."

At about the same time, Windows pops up an info or error message that I do not have access rights.

After I changed the "sharing" rights on the target folder (external disk) so the folder was shared with the administrator (Grover is the user and also the administrator) , the next schedule time, the task ran and was successful for all subsequent backups.

Whether there is a relationship, I am unsure. Just reporting what happened to me.

Not sure, I don't get any indications of an error other than the tab "Backup is corrupted" appearing and the log virtually identical to the one above from John Wilson.

I managed to resolve the "Failed to open data stream." error by clicking "explore all backups" and telling ATI to "Ignore" the backups it couldn't find. After I had done this the next backup run completed successfully.

I have no doubt the issue will come up again next time the backup drives are swapped, but it does suggest that the problem is to do with ATIH looking for old versions of the backup at completion (incremental mode) and failing to find them. Looking forward to a REAL solution from Acronis though.

VPC Techs,

If you switch drives, you should consider running 2 different tasks and assign a different letter to each drive. Otherwise, ATI will try to track where each backup has been done, and that might spell trouble at restore time.

VPC Techs,

Where do you click "explore all backups?

VPC Techs,

Can you validate your backups?

My main PC with LSI hardware RAID had a disk fail. Sparing you the details, I ended up restoring the whole-disk partition to a newly-configured drive (hint: "logically" not the same as before hardware failure) from Acronis. The restoration was fine, but subsequent backups using the same Acronis TI backup task generated the "Failed to open data stream" at the end of the task. This problem was resolved by creating a new backup task. (In my case, I happened to change my naming convention so that the new task is independent of the old task .tib files.) Including "validation" as part of the task does not seem to impact the problem, as demonstrated by a separate newly-created task.

So for me, the resolution of just deleting the old task that generated the failure and creating a new version of it resolves this issue.