error code 100206

Hi - Comodo threw an error 100206 whilst attempting the 1st set of a planned incremental backup to NAS.
I’d earlier made 2 manual test runs of the same file sets without scheduling, simple file copy, raw data, include folder listing. Any ideas please? Is there a published list of error messages (that I may have missed).
Thank yow.


Do you have the log of the backup?
It might be that a file name extension is too long for the NAS destination.


Indeed - I noticed that file names had become twice-repeated strings of those intended - I’m guessing due to several back and forth attempts to set name/insert macro correctly. Clumsy of me.

Thanks for your attention . .