Unable to Back up On-Demand Files (code 1633)
Situation
A backup plan failed with one of the following error messages:
On-Demand files cannot be backed up due to known Microsoft issue. Try to fix OneDrive.
2023-05-28 08:02:08,500 [PL] [1] ERROR - An error occurred (Code: 1003) Description: The tag present in the reparse point buffer is invalid.
Cause
This error occurs due to an internal error specific to the OneDrive application, generally related to a problem with OneDrive object synchronization.
It could happen if the local OneDrive directory that you are trying to access for backup purposes is corrupted, or if any operating system processes prevent the OneDrive application from synchronizing its objects successfully.
Solutions
Solution A
Reset or re-sync your local OneDrive application as described in this Microsoft official help article.
Solution B
Run the "chkdsk" command in an elevated (i.e., launched under a local administrator account) Windows command prompt:
chkdsk C: /r /f
Where:
C: - Disk letter for the drive that is going to be checked. Specify the letter of a disk that contains your OneDrive-related directories (in most cases, it would be a system volume "C:").
/f - Parameter enabling the disk error check.
/r - Parameter enabling the recovery of readable data from faulty disk sectors.
Solution C
Exclude the affected OneDrive on-demand files/directories from the source scope of your backup plan.