truecrypt supported just one file for a container.
to have 128GB encrypted space, you had to store it in one file with 128GB.
as example, it would be great to have 16 8GB files to store 128GB.
if you then add a new files to the 128GB container, you just would have to copy the updated 8gb file, not the whole 128gb for backup.
furthermore there could be a possibility to add a 8GB file to increase the container to 136GB.
aboutme: i am a database gui for sybase and oracle. the concept is similar to a oracle tablespace or a sybase device.