Problems with mirror --reverse

[alex]

I have a problem with mirror command.

I use the following command to backup my local folder to ftp host:

lftp -c "open $FTPDIR; \
set ftp:charset cp1251; \
set mirror:set-permissions off; \
set ftp:use-telnet-iac no; \
mirror --reverse --dereference --only-newer  --delete --verbose=3  
--exclude-glob '*/.*' --exclude-glob '*/.*/'  $LOCALDIR . "


but each time i run lftp, it recopies all files again. How can solve this  
problem.

Thank you, i appreciate any help.