Problem:
Like a shooting star, sometimes can happens that some backup job on a Synology NAS fails with this error:
Error: Incorrect function. Agent failed to process method {ReFs.SetFileIntegrity}.
with VB&R 11.0.1.1261 and DMS 7.0.1 with a SMB share.
It seems to be related to “Fast clone” feature inside Synology control panel.
Solution:
Adding this registry key in the VB&R machine seems to solve the issue
[HKEY_LOCAL_MACHINE\SOFTWARE\Veeam\Veeam Backup and Replication]
"UseCifsVirtualSynthetic"=dword:00000000
As reported in this thread, that registry key tweaks the full fast clone feature.
More about this topic:
All said above, I found this topic on reddit where the issue is present on Veeam 9.5u4 and always a Synology NAS
https://www.reddit.com/r/Veeam/comments/omridr/synology_ds1821_and_veeam_95u4/
What is Fast clone:
https://kb.synology.com/en-id/DSM/help/DSM/AdminCenter/file_service_advanced_introduction?version=7