I don't think there is much that can be done except possibly going through them all and see if they are absolutely necessary to be filed or can be discarded. When I first started working in my job we had a tremendous backlog. I had many people involved in cleaning it up and offered OT. Once we were caught up it was smooth sailing. You definitely want all that in there before you start scanning. Good luck.
I hear you! Sorry I cannot be more helpful.