QUOTE
Would stick with the idea of archiving the originals.
I agree and the question then becomes how best to do that. Is there any advantage of using a disk image instead of a burn folder? If the disk image does any type of compression, I would fear that the de[/]compression might be unsupported at some time in the future. Of course, even the file system used in a plain file burn could also become obsolete.
With either of these two methods, I don't think there is any 'automatic' warning that you may be trying to put too much on a disk. Other than the warning after the normal 'drag-n-drop.' And I'm not even sure that a burn folder will warn you then, the warning may not come until you insert a disk to burn the collection. 
I think I'll see what Apple says about these two methods...
QUOTE
Would stick with the idea of archiving the originals.
I agree and the question then becomes how best to do that. Is there any advantage of using a disk image instead of a burn folder? If the disk image does any type of compression, I would fear that the de[/]compression might be unsupported at some time in the future. Of course, even the file system used in a plain file burn could also become obsolete.
With either of these two methods, I don't think there is any 'automatic' warning that you may be trying to put too much on a disk. Other than the warning after the normal 'drag-n-drop.' And I'm not even sure that a burn folder will warn you then, the warning may not come until you insert a disk to burn the collection. 
I think I'll see what Apple says about these two methods...
Main difference I see is that a disk image would be useful for making multiple copies (disks) of the same info. It must be sized when it is created for the type of disk one will be using. It appears that the current disk imaging system does not include a Read-Only (compressed) version that was available before OS X. I will, therefore, assume that there is no change made to the files being burned. The format is important and should be selected with the future OSs in mind.
Burn Folders appear to be much simpler to use. Just use the File menu in Finder to 'create' one. Drag-n-drop the files you want to save checking the size of the folder. Even better, check the bottom of the Finder window! The window will display the number of items and the "minimum disc size" needed. It will not warn that you have too many bytes for any specific media, however. But that info should be known by looking at the media or its packaging. The format will probably be whatever is set for your internal drives. However, the folder can be "compressed" simply by using the File menu item. That would result in a ".zip" file. In fact the folder will be treated like any other folder even though it is actually a "virtual" one.