Creating symlink errorcode=1392

Since two weeks the incremental file backup (Win10 pro Clients) does not work anymore. We are using Urbackup Client 2.4.11 and Server 2.4.14 (Windows).
It worked for year with no problem. Now we get the following error:

22.04.22 12:59 INFO Starting unscheduled incremental file backup…
22.04.22 12:59 DEBUG EDORU08GERI: Doing backup with hashes…
22.04.22 12:59 DEBUG EDORU08GERI: Connecting for filelist…
22.04.22 12:59 DEBUG EDORU08GERI: Waiting for filelist
22.04.22 12:59 DEBUG EDORU08GERI: Connecting for filelist (async)…
22.04.22 12:59 INFO Selected no components to backup
22.04.22 12:59 WARNING Restarting shadow copy of C:\ because it was started by this server
22.04.22 12:59 INFO Scanning for changed hard links on volume of “C:”…
22.04.22 12:59 INFO Indexing of “C” done. 1 filesystem lookups 8040 db lookups and 1 db updates
22.04.22 12:59 DEBUG EDORU08GERI: Doing backup with hashed transfer…
22.04.22 12:59 INFO EDORU08GERI: Loading file list…
22.04.22 12:59 DEBUG EDORU08GERI Starting incremental backup…
22.04.22 12:59 INFO EDORU08GERI: Calculating file tree differences…
22.04.22 12:59 INFO EDORU08GERI: Calculating tree difference size…
22.04.22 12:59 DEBUG GT: Loaded file “DumpStack.log.tmp”
22.04.22 12:59 DEBUG PT: Hashing file “DumpStack.log.tmp”
22.04.22 12:59 DEBUG HT: Copying file to “D:\urbackup\EDORU08GERI\220422-1259.hashes\C\DumpStack.log.tmp”
22.04.22 12:59 DEBUG HT: Linked file: “D:\urbackup\EDORU08GERI\220422-1259\C\DumpStack.log.tmp” (id=1)
22.04.22 12:59 ERROR Creating symlink at “D:\urbackup\EDORU08GERI\220422-1259\C\Documents and Settings” to “C\Users” failed. Die Datei oder das Verzeichnis ist beschädigt und nicht lesbar. (errorcode=1392)
22.04.22 12:59 INFO Waiting for file transfers…
22.04.22 12:59 INFO Waiting for file hashing and copying threads…
22.04.22 12:59 INFO Writing new file list…
22.04.22 12:59 DEBUG Some metadata was missing
22.04.22 12:59 ERROR Fatal error during backup. Backup not completed
22.04.22 12:59 INFO Transferred 3.80054 MB - Average speed: 9.40173 MBit/s
22.04.22 12:59 DEBUG Script does not exist urbackup\post_incr_filebackup.bat
22.04.22 12:59 INFO Time taken for backing up client EDORU08GERI: 33s
22.04.22 12:59 ERROR Backup failed
Does anybody know, what the reason could be for this problem?
Kurt

Run chkdsk /r on the storage.
Followed by remove_unknown.bat if chkdsk makes repairs.

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Thank you David for you help!

CHDKS and remove_unknown.bat took a long time, but now all works fine again!

Regards - Kurt

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