Mirror to remote except particular folder present on remote

Hello all,

I usually edit my website locally and push it with this command:

lftp -u user,password host -e "mirror -c -e -R -x ^\.git/$ my /my; exit"

But now, my website dynamically adds data to the /my/data/ folder.

I don't have this /my/data folder locally.

*QUESTION:* How to push without deleting/overwriting /my/data and its
content?

Notes:

   - I could download /my/data and then run the command above, but data
   added in the few seconds before the download and the upload would get lost.
   - For the other files/folders, local deletion should be mirrored by a
   remote deletion.
   - I don't want to use --only-newer-like operations because clocks might
   not be adjusted.

Thanks a lot!
Nicolas Raoul

PS: Originally asked at http://unix.stackexchange.com/q/119458 but no
answer there...

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