Acronis Backup Cloud Known Solutions

Your Acronis Backup Cloud quick troubleshooting kit. Below are the most recently published and the most popular articles. The solution you are looking for is most probably right here.

Most recent articles

Space usage report in CSV format contains unnecessary info

You are using Acronis Data Cloud 7.8

Your Customers are registered in JP1 data center. Since update to 7.8, you noticed that the Space usage CSV report contains the below details:

"Project-Id-Version: PACKAGE VERSION
POT-Creation-Date: 2016-01-01 01:01+0100
PO-Revision-Date: 2015-11-13 10:42+0300
Last-Translator: Team-Localization-Dev@
Language-Team: Acronis L10N Team
Language: ja
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Plural-Forms: nplurals=1; plural=0;
X-Generator: Acronis xliff2po

ESXi configuration backup fails with "too many SQL variables" or "Command definition 'SELECT ...' not found."


  1. You have a large vSphere environment, with several ESXi hosts and 1000+ virtual machines
  2. You install Agent for VMware and connect it to vCenter.
  3. You try to run a ESXi configuration backup for a host and the backup fails with one of the following errors:

    too many SQL variables


    Command definition 'SELECT ... '  not found.

Example of error log:

Hyper-V virtual machine backup produces warning "Changed Block Tracking (CBT) is not used "


Agentless backup of Hyper-V virtual machine(s) produces the following warning:

Changed Block Tracking (CBT) is not used because there are disk files that do not belong to any disk snapshot.


Possible causes are:

1. Issues with the checkpoint tree of the affected virtual machine.

Applies to: on-premise Storage setup only.


  1. Your Customer uses own Storage software
  2. Their End-Users start receiving the following error upon backup:

sslv3 alert bad certificate 

Optional symptoms

The following errors may also occur but they are not a direct indication of TLS issues:

1. Error "The password for the protected backup is incorrect" upon backup or browsing of the archives 


You faced an issue with the registration of the Agent during the automatic installation and try to use the instruction from the article 55244:Acronis Backup Cloud: Registering Backup Client Manually

The RegisterAgent tool gives you an error:

Backup fails with "The network path was not found" or "Cannot connect to the machine where network share ' path' is located"

Backup fails with one of these errors:

Windows error: (0x80070035) The network path was not found


Cannot connect to the machine where network share 'path' is located. The machine may be offline or is experiencing communication problems due to a network error or lock-up.


Backup fails with:

Failed to resolve hostname (or another storage name)

Full error text:

Backup fails with "VSS writer 'System Writer' with class ID 'E8132975-6F93-4464-A53E-1050253AE220' has timed out" error"

Backup fails with:

Windows error: (0x800423F2) VSS writer 'System Writer' with class ID 'E8132975-6F93-4464-A53E-1050253AE220' has timed out. This may be caused by too intensive I/O on the machine at the backup start time. Try to re-schedule the backup to some different time. To troubleshoot VSS issues, download and run Acronis VSS Doctor available at

Backup fails with "Internal error: An expression test has failed"

Backup fails with:

Internal error: An expression test has failed.

"The storage quota is exceeded. Further backups will fail." error

Backup fails with error:

The cloud storage quota is exceeded for 'User'. Further backups will fail.


Most viewed articles

"Failed to Connect to the Process" error

You may get the error when starting a backup plan destination to SAN, complex RAID or dynamic disk arrangements, or Cloud storage. To fix it, add a value StartTimeout in Windows registry.

"The shadow copy provider had an unexpected error while trying to process the specified operation"

VSS-Backup fails with "The shadow copy provider had an unexpected error while trying to process the specified operation". To solve this issue, troubleshoot the VSS provider mentioned in the message.

"Failed to read the snapshot"

You attempt to perform a disk or partition backup that fails with the following error: "Failed to read the snapshot."

"Backup failed" alert

A backup did not complete successfully.

"Backup finished with warning", "Activity finished with warning", "Activity failed" alerts

An operation in Acronis Backup 12.5/12, Acronis Backup Cloud, or a customized backup solution based on Acronis Backup Cloud finished with a warning message or failed.

"Backup did not start" alert

This alert is displayed when our product detects that a backup activity was not started at the scheduled time. For example, if a machine was turned off during scheduled backup time, this alert will be displayed the next time it is connected to the Management Server.

Machine is offline in Backup Management Console

After successful installation, the machine is offline in the Backup management console.

"Backup status is unknown" alert

This alert appears when the agent machine is offline during a scheduled backup. In this case, our Management Server has not received information whether the backup is running successfully or failed.

"Link target was not backed up" or "The file is out of backup scope" warnings

You create a backup. Backup completes with warning "Link target was not backed up" or "File {1} pointed by symlink {0} will not be backed up because the file is out of backup scope." Warning notifies that symbolic link target is not included in the backup.

"VSS writer 'SqlServerWriter' with class ID 'A65FAA63-5EA8-4EBC-9DBD-A0C4DB26912A' has failed to process the snapshot"


Backup fails with the following message:

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