I have messed the ext4 partition resizing it with Gparted, it still works but shows the old size and Link2sd doesn't seem to be able to link all the pieces.
I was wondering if I could backup the content with Titanium or other, format the partition at the correct size with Gparted and then restore the content to the new larger partition.
I know the ext4 cannot be resize but I guess that it can be deleted and created again, what I am not sure if there is something in the current ext data that is dependent on the size of it. I think that is why I should not be doing a backup image directly but instead backup the files individually.