Question Original Photos Folder

I am planning on migrating my 1.5 Joomla! website to 2.5 very shortly. However, the website even in its JPA file format is quite sizeable. Within the images folder is another folder called "original photos." This alone is 1.5 GB in size. I believe that this folder contains all images uploaded onto our kunena forum. I use three programs when migrating to 2.5 Joomla!. I use Jupgrade, Akeeba and kickstart. What I'm finding is happening with one of my websites that is quite big is that for some strange reason the images folder is not being migrated. So when I finally open up the 2.5 website all the images are missing. I'm beginning to wonder whether it's because the images folder is too big and Akeeba is not including it in the backup. I think the first thing I am going to do is stop people from uploading onto our server from the forum. The other question I have is within the "original photos." folder are several files related to Facebook. An example would be Facebook_Connector_00000000. There is also a folder called "group photos." Obviously I am aware that removing any photos within the folders will remove them from the website. But what about all the other files, can they be removed?