True Image 2021 Backup fails since one month

Hello,
I am using True Image 2021 for creating weekly incremental backups to a Synology NAS from my Windows 10 computer.
It worked well till 3 weeks ago but now there is a message after finalization of the backup that there is an error in the File System and I should check for Errors (see attached screenshot). I checked the drive with chkdsk and also with "sfc /scannow"
The first run of sfc said that it had repaired something. I rebooted and reran the tool. Now it didn't find any errors. Also checkdisk finished without errors.
I repeated the backup but again it ended with the same error message.
It created the *.tibx file on the NAS but in Acronis it does not mention this backup as available for Restore.
What can I do to locate the file system errors and repair them?
Thanks for your help in advance
Best Regards
Harald
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Steve Smith wrote:.....
Depending on your source selection then errors could come from any hidden / system partitions that are included but which are not checked using CHKDSK unless you have allocated a drive letter to the partition.
The logs for the backup task may give more detailed information on where the errors are coming from.
I agree with Steve that this a a distinct possibility - I had it happen once some years ago.
Ian
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