Titanium can back up the apps, but what happens when you swap cards? All of the apps that are on the partition will break when you do that, which will include Titanium if you move that. So you need to get Titanium off the card, and restoring everything else may be a bit messy (I remember Link2SD being a bit fragile). It would be doable, just may be messy.
The CWM nandroid should be a folder with several images in it. Looking in there you should be able to see whether there is one for the sd-ext. Also look in CWM settings to check whether it is set to back up the partition.