Yesss!!! That's the trick. Now it works.
Thank you!
Thank you!
winscp.com nbbackup /command "synchronize remote d:\nbbackup /nbbackup -delete -mirror"
winscp.exe nbbackup /command "synchronize remote d:\nbbackup /nbbackup"
winscp.exe nbbackup /command "synchronize remote d:\nbbackup /nbbackup -delete -mirror"