Create backup of actual directory on dropbox (bash). You can add this feature to your .bash_profile or .bashrc, and call it from a terminal when you need to back up a folder.

gistfile1.sh

backupOnDropbox(){
    STRNOW=`date +"%Y%m%d%H%M"`;
    STRNAMEDIR=`basename $PWD`_;
    STRDESCFILE='_backup.zip';

    zip -r $STRNAMEDIR$STRNOW$STRDESCFILE *
    mv $STRNAMEDIR$STRNOW$STRDESCFILE ~/Dropbox/
}