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How To Fix Acronis Cloud Backup Fails!

Acronis Cloud backup fails happens because of different reasons. The most common reasons and their solutions are listed below:

Backup Error Message

  • The drive is not ready 
  • The device is not ready

Cause 1:

The disc device is not responding adequately to read/write requests, which might be a momentary malfunction or a permanent breakdown of the device.


Attempt transferring a file from the specified backup source to the backup destination using Windows Explorer to confirm that factor


  • Reconnect external disk
    • Eject the drive safely
    • If the drive is connected to an external power source – disconnect it, wait for 10 seconds, and then reconnect it
    • After that, reconnect the disk to a different port on the system 
    • NAS devices: reboot the NAS(network-attached storage devices)

Cause 2:

Corrupted file system or disk partition table


  • Reboot your system.

Backup Error Message

  • Disk Is Full

Cause 1:

There isn’t enough space on the disc where backups are stored.


  • Automatic cleaning of backup versions not displayed in the Acronis True Image interface is not possible. To make a fast check, enter the “Recovery” dialogue and broaden your choice of dates – compared to recovery points.TIB files Failed to establish automatic cleaning rules.
  • For no reason have previous backup versions been removed.
  • There were no Acronis files on the disc where backups are saved.

Cause 2:

  • NAS: the NAS user account limit (quota), stated in backup configuration, has been reached. This quota is set up in NAS settings outside Acronis programme. Acronis has nothing to do with that. The NAS user account is entirely unconnected to the Acronis account and is only configured via the NAS administration panel.

Cause 3:

  • External drive, where backups are saved, has quotas enabled for different Windows users. To check if that is the case, right-click the disk in Windows Explorer, click on the Quota tab and click “Show Quota settings.”

Cause 4:

  • Not enough free disk space on the source disk for Microsoft VSS snapshot

Cause 5:

  • Too high disk activity on the source disk causes Microsoft VSS snapshot to cancel and delete

Solution 1:

  • Make sure other software doesn’t fill the disc space where the backups are stored. Transfer or remove files from other programmes to a different disc or location.

Solution 2:

  • If.TIBs are missing in the Recovery Date/Time list, turn off the self-defense function mentioned on https://kb.acronis.code/content/60190 and remove those orphaned.TIBs from the destination drive. When backups are needed, add them to the list according to and find out which other backs/backup versions you want to remove to free disc space.

Solution 3:

  • Correct the rules for automatic backup deletion and free up disk space:


  • Enter backup settings – tab “Backup scheme” and adjust cleanup settings: reduce the number of backup chains to keep (a backup chain is a full backup and all the incremental/differentials before the next full backup). Earlier backups are deleted by chains. Deletion of any backup version is postponed until all the chain is subject to deletion.
  • Free up disk space by deleting backups – click the arrow key next to the backup name in Acronis True Image to open the menu, choose “Delete” – “Delete entirely” or “Cleanup versions.”

Solution 4:

  • Close all other programs when running the backup, especially antivirus, security and software that could be intensively reading or writing data to disk: data synchronization, copying, backup, cataloguing, search and indexing.

Solution 5:

  • Run the free Acronis tool for troubleshooting Microsoft VSS issues: Acronis VSS Doctor.

Backup Error Message


Backup versions occupy too much disk space in the Cloud



  • Reduce the number of backup versions to keep in the backup settings, delete earlier versions
    • Open backup settings“Options”tab “Advanced” – “Acronis Cloud cleanup”, reduce the number of versions to keep, and the amount of time the versions are stored in the Cloud.
    • Click “Account” on the left action bar – click “Browse my data”, mouse over the backup and click the gear icon that will appear, to access the backup cleanup and delete menu options.


  • Download some of your backups from Cloud locally, then delete those backups from Cloud:
    • Click “Backup” on the left action bar in Acronis True Image, click the backup, then click Recovery at the top of the screen, follow the offered steps to download the files.
    • Click the small arrow next to the backup name in the backups list, select Delete – click Yes.

Solution 3:


  • If you need all of the backups, including all accumulated backup versions, and room for new backups – buy more storage space:
    • Click “Account” on the left action bar.
    • Click the “Upgrade” button.
    • Choose the appropriate new storage quota and proceed with the purchase wizard. Know more at