65338: Acronis Cyber Protect, Acronis Cyber Backup: File backup fails with "Incorrect function"

Last update: 04-05-2021


File/folder backup containing encrypted files ends with the following warning:

Windows error: (0x80070001) Incorrect function


The file reports itself as Encrypted, however is not really encrypted. As a result using Microsoft Windows procedure to read encrypted data from file fails.


As a workaround, to avoid this warning exclude this file from your file backup: the file that causes the error can be found in error log after "path"  (e.g. path: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy8\data\document_01.docx )

You can still protect this file by running an image backup of the entire disk or volume.