You are expanding the DESTINATION variable, if you did echo this is what you would get:
echo ${DESTINATION}
/home/hogar/Ubuntu\ One/folder
But mv doesn't understand this:
mv ${FILE} ${DESTINATION}
mv: cannot move '/home/hogar/Documents/files/bdd.encrypted' to '/home/hogar/Ubuntu\\ One/folder': No such file or directory
(for some reason my mv is more verbose)
To prevent this you should use quotes instead:
mv "${FILE}" "${DESTINATION}"
If you don't need expansion (since you are already expanding before) just using "$..." should suffice:
mv "$FILE" "$DESTINATION"
