These are questions asked in the context of the proposed architecture described in the forum thread titled, "Sample JDO Architecture for Follow Up Questions".
I saw a forum statement, which I can't find now, that led me to believe that ObjectDB database files do not compress well (in general, my architecture usage may be different). I plan on NOT compressing NOR trying to reclaim unused space in ObjectDB database files when I back them up or restore them from a backup.
Do you have an experienced opinion on this approach?