FileProcessingFailed

Support
1

Hello everyone,

I have an external hard drive where I back up my photos. Lots of folders with lots of photos. During my last backup attempt, I got the following message:

“2026-03-31 08:35:41 +02 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-FileProcessingFailed]: Failed to process path: H:\\My_Pictures\\16__Vacation\\2024_06__Summer_Vacation__Grundlsee\\06_28__Friday\\01__RAW\\_DSC3794.NEF\r\nIOException: Data error (CRC check): '\\\\?\\ H:\\My_Pictures\\16__Vacation\\2024_06__Summer_Vacation__Grundlsee\\06_28__Friday\\01__RAW\\_DSC3794.NEF '"

Different messages appeared in other direct orie s:

“2026-03-31 08:36:31 +02 - [Warning-Duplicati.Library.Main.Operation.Backup.MetadataGenerator.Metadata-MetadataProcessFailed]: Failed to process metadata on \“H:\\My_Pictures\\ 16__Vacation\\2023_04__Ammerwald\\04__26__Panorama_Hoehenweg__Hoefen_Waengle\\02__JPG\\_DSC3365.JPG\“, storing empty metadata\r\nInvalidOperationException: Method failed with unexpected error cod e 43 3.””

“2026-03-31 08:36:31 +02 - [Warning-Duplicati.Library.Main.Operation.Backup.FileBlockProcessor.FileEntry-FileProcessingFailed]: Failed to process path: H:\\My_Pictures\\16__Vacation\\2023_04__Ammerwald\\ 04__26__Panorama_Hoehenweg__Hoefen_Waengle\\02__JPG\\_DSC3365.JPG\r\nIOException: A non-existent device was specified. : ‘\\\\?\\H:\\My_Pictures\\16__Vacation\\2023_04__Ammerwald\\ 04__26__Panorama_Hoehenweg__Hoefen_Waengle\\02__JPG\\_DSC3 365. JPG’“”

However, there are many other images in each directory that were backed up without any issues. What is the reason for the se messages?

2

Look it, the “Data error (CRC check)” warning is the important one. That error doesn’t come from Duplicati itself, it’s what Windows returns when it tries to read a file from the drive and the data is unreadable at the hardware level. It means either the specific file is corrupted on disk, or more concerning, the external drive itself is developing bad sectors.

Duplicati handled it correctly by skipping those files and logging warnings rather than crashing. The backup job still ran, but those files were not included in the backup.

Two things to do now. First, run a check disk scan on the external drive to find and mark any bad sectors. Open Command Prompt as Administrator and run:

chkdsk H: /f /r

The /r flag scans for bad sectors and attempts to recover readable data. This can take several hours on a large drive. When it finishes, check what it reports.

Second, look at the SMART health data for the drive. You can use CrystalDiskInfo (free) to check this. If you see reallocated sectors, pending sectors, or uncorrectable errors in the SMART data, the drive is physically failing and you should copy everything off it immediately while you still can.

As for the RAW files that failed, they may be recoverable using a tool like Recuva or PhotoRec if the drive hasn’t fully failed yet. Worth trying before the drive gets worse.

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