61704: Acronis Backup 12.5: Backup hangs when backing up to NTFS

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Applies to: 


  1. You create a large backup to a destination formatted in NTFS 
  2. Backup starts correctly, but hangs after making some progress 
  3. Windows Event log contains messages similar to the following one:

    Event 141, Ntfs 

    {Delayed Write Failed} Windows was unable to save all the data for the file drive:\some_path\......1\_.tibx; the data has been lost. This error may be caused if the device has been removed or the media is write-protected. 

  4. If you check Process monitor log, it contains messages about file system limitation, see example of such message below

High Resolution Date & Time: 04.07.2018 11:05:21,0505604 
Event Class:File System 
Operation: WriteFile 
Duration: 0.2459490 


Acronis Backup 12.5 is unable to write data to this archive due to NTFS limitation


  1.  In Backup Options -> Splitting enable fixed size split backup and set slice size between 100GB and 500GB, and create a new backup archive.

    (!) Splitting option is not available for Always incremental backup scheme.

  2.  If there are slices that need to be saved from original archive, you should export them first to new archive with split size and then delete the source archive. Then you can continue backing up to new archive.

More information

In case you are specially preparing a storage with NTFS file system for storing large backups, for better handling of large files it is recommended to set a 64 KB NTFS allocation unit size and enable support for large file record segments (FRS) on the partition: see Formatting requirements for large files in this document for more information.


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