I think Duplicati can’t backup files on a Volume with data deduplication service enabled on Windows Server 2012.
This is what i’m talking about: Introduction to Data Deduplication in Windows Server 2012 | Storage at Microsoft
I noticed this when i tried to backup a folder on D: (with that service enabled) to a local USB drive as destination. It finished way too fast and i noticed it skipped with error most of the files.
ExaminedFiles: 3114
OpenedFiles: 3114
AddedFiles: 3114
FilesWithError: 5748
The total files on that folder is 3114+5748.
I see some files in the log with this error.
Warnings: [ Failed to process path: D:\MYFOLDER\72A4D459.tmp => I/O error.,
On the same Windows Server, but on the E: drive (with the data de-dupe service disabled) the backup runs fine.
I tried with snapshop policy required and off, both give me error on all those files. Tried changing duplicati to run as a service and still errors. Tried another folder on the D drive, still errors.
I see some VSS errors on event viewer with ID 8194.
“Volume Shadow Copy Service error: Unexpected error querying for the IVssWriterCallback interface. hr = 0x80070005, Access Denied.
This is often caused by incorrect security settings in either the writer or requestor process.”
Is there a switch in the advanced settings for this?