Hate to lose the old files.
I understand Bob, but if they are attached that means that you have them on your computer so I'm placing the responsibility on you to store your files and if they were posted by someone else photos you have the ability to download them and save. We aren't hosting a photo sharing site here
@Jim ... actually not sure but I am checking if, as the storage fills, it deletes old files to make way for the new. I do have the ability to go through and selectively remove attachments (as I just did on the old ones).
My thought on this is that the ability to store you photos on the forum is a bonus. The only way to really make sure the images stay here is to link to them using the img tags.