Hi, after backup I get error like this:
[Warning-Duplicati.Library.Main.Operation.Backup.FileEnumerationProcess-FileAccessError]: Error reported while accessing file: \10.10.11.2\d\System Volume Information
UnauthorizedAccessException: Access to the path ‘\?\UNC\10.10.11.2\d\System Volume Information’ is denied.
How I can fix it?
Hi @pbialy, welcome to the forum 
This is because you are attempting to read some internal Windows data. You should exclude that folder (and perhaps also some others) as it does not contain any information that makes sense to restore.
On the other hand, it does not in any way affect the making of copies and their subsequent reading, if any?
Ok, I unchecked the files you mentioned and indeed - it works! Thank you! 
It does not have any effect other than the files not being in the backup, and a warning on each run.