i need to find my bridge collection user files,

I have backed up my image files to an external drive. I use Bridge to view and sort images that came with Photoshop CS5.0 i have built some collections and would like these to move with the images on to to my back up drive so i can acess them from both my MacBook and my iMac, both are 10.7.3 mid 2007 machines. the images appear along with and labels (colours and stars) but collections do not!