Backup that includes OneDrive folder fails with an error similar to one of the following:

Failed to enumerate directory 'C:/Users/myusername/OneDrive/'. It may be corrupted or does not exist

Failed to back up file or folder 'C:/Users/myusername/OneDrive/'.It may be blocked by another application

Error occurred while opening the file


C2C agent tries to apply a protection plan to O365 mailboxes, Sharepoint, etc.

Activity fails with:

A backup agent error: 'nothing is processed in protection applying'

Cause 1

The alert could appear if there are new resources but they weren't protected when applying the plan, for example when there are new items discovered in Microsoft 365.

File-level backup (Version 11 format) containing a personal OneDrive folder fails with:

| error 0x4000c: The file is read-only.
| line: 0xf35f747b3b21fd14
| file: e:\21\core\file\windows\winnt_dir.cpp:1547
| function: winnt_dir::iterator::GetHardlinkCountValue
| function: OpenFileW
| path: \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy1\Users\tester\OneDrive
| $module: disk_bundle_vsa64_11010
| error 0xfff0: The media is write protected
| line: 0xbd28fdbd64edb8f1
| file: e:\21\core\common\error.cpp:307
| function: Common::Error::AddWindowsError
| code: 0x80070013
| $module: disk_bundle_vsa64_11010


  • C2C backup of Microsoft OneDrive fails with: 

    "Service 'Microsoft OneDrive' is temporarily not available. 'Error: 404 GET {\"error\":{\"code\":\"itemNotFound\",\"message\":\"The resource could not be found.\",\"innerError\":


Starting from Acronis True Image 2019 Update 2 (Build 14610) you can back up OneDrive and mailboxes for Microsoft 365 Consumer accounts. Backups are saved to Acronis Cloud. You need Acronis Cyber Protect Home Office/Acronis True Image Advanced or Premium subscription to use this feature.


Attempting to recover backed-up OneDrive files using the Web Restore console fails with the following error message:

Restore error... Unsupported file type..


Due to Office 365 integration between Acronis platform and Microsoft, customers may not be able to interpret how the changes in Office 365 are synced on Acronis side.

In this article we will explain how Acronis Microsoft 365 seats in per workload model are billed for Admin users (external users), Microsoft Teams users and SharePoint users.


Scenario 1

Customer never switched on OneDrive for the user but the user is shown to have OneDrive in Acronis, thus seat is counted.