UbuntuOne worked and all my folders were synced (~8 GB). Currently UbuntuOne shows only 4.7GB synced.
Then I had to re-install Ubuntu from scratch (11.10). Since then I cannot mark folders as "Synchronize this Folder". I Right-click on my folder in my home folder and choose "UbuntoOne > Synchronize this folder". But it does not do anything. It does not show any of the sync status available "Not synchronized" "Synchronizing" "Synchronized" nor the correspondent symbols either after that. I tried on several folders and .