Currently it is not copying all my files to Nas. Problem is path limit to 247 character bat windows allow for me 290. Can in aplication synology drive client allow more character for path.
I tried the same file to backup at my friend’s qnap and everything works.
So unfortunately this is a hard limitation set in Synology Drive, due to windows compatibility.
The name or path of the folder/file is longer than 247 characters
So the way around this is 2x options:
Move your folder to shorter destination on the disk
Just copy these files over using smb (by mapping a network drive). Windows file explorer has this limitation still, but you can just use robocopy to get around it